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On Combat, The Psychology and Physiology of Deadly Conflict in War and in Peace

On Combat, The Psychology and Physiology of Deadly Conflict in War and in PeaceAuthors: Dave Grossman, Loren W. Christensen
Publisher: Warrior Science Publications
Category: Book

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Rating: 4.5 out of 5 stars 150 reviews
Sales Rank: 3,065

Media: Paperback
Edition: 3rd
Pages: 403
Number Of Items: 1
Shipping Weight (lbs): 1.4
Dimensions (in): 8.1 x 5.5 x 1

ISBN: 0964920549
Dewey Decimal Number: 616
EAN: 9780964920545
ASIN: 0964920549

Publication Date: October 1, 2008
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Product Description
On Combat looks at what happens to the human body under the stresses of deadly battle the impact on the nervous system, heart, breathing, visual and auditory perception, memory - then discusses new research findings as to what measures warriors can take to prevent such debilitations so they can stay in the fight, survive, and win. A brief, but insightful look at history shows the evolution of combat, the development of the physical and psychological leverage that enables humans to kill other humans, followed by an objective examination of domestic violence in America. The authors reveal the nature of the warrior, brave men and women who train their minds and bodies to go to that place from which others flee. After examining the incredible impact of a few true warriors in battle, On Combat presents new and exciting research as to how to train the mind to become inoculated to stress, fear and even pain. Expanding on Lt. Col. Grossman s popular "Bulletproof mind" presentation, the book explores what really happens to the warrior after the battle, and shows how emotions, such as relief and self-blame, are natural and healthy ways to feel about having survived combat. A fresh and highly informative look at post traumatic stress syndrome (PTSD) details how to prevent it, how to survive it should it happen, how to come out of it stronger, and how to help others who are experiencing it. On Combat looks at the critical importance of the debriefing, when warriors gather after the battle to share what happened, critique, learn from each other and, for some, begin to heal from the horror. The reader will learn a highly effective breathing technique that not only steadies the warrior s mind and body before and during the battle, but can also be used afterwards as a powerful healing device to help separate the emotion from the memory. Concluding chapters discuss the Christian/Judeo view of killing in combat and offers powerful insight that Lt. Col. Grossman has imparted over the years to help thousands of warriors understand and come to terms with their actions in battle. A final chapter encourages warriors to always fight for justice, not vengeance, so that their remaining days will be healthy ones filled with pride for having performed their duty morally and ethically. This information-packed book ploughs new ground in its vision, in its extensive new research and startling findings, and in its powerful, revealing quotes and anecdotes from top people in the warrior community, people who have faced the toxic environment of deadly combat and now share their wisdom to help others. On Combat is easy to read and powerful in scope. It is a true classic that will be read by new and veteran warriors for years to come.


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5 out of 5 stars Wow!   November 8, 2004
L. A. Kane (Seattle, WA USA)
191 out of 203 found this review helpful

Advertising for this marvelous work states, "a ground-breaking examination of what it takes to perform, cope and survive in the toxicity of deadly combat as a soldier in a foreign land and a police officer in the mean streets of urban America." It really is all that, and more... Outstanding isn't a strong enough word to describe it.

If you are a soldier, a police officer, a martial artist, the holder of a concealed weapons permit, or just live in a bad neighborhood you really ought to read this book. Both authors really know what they're talking about, clearly able to articulate hard won wisdom in this well-written and comprehensive tome. Their thought-provoking, insightful work definitively examines every aspect of the psychology and physiology of deadly conflict.

The book begins by describing what happens to a person anatomically during a battle then covers the perceptual distortions that take place in combat. Having done college studies on eyewitness testimony and psychology and the law I recognize and agree with many of their points. The second half of the book covers why people put themselves in harms way and what happens to them after the smoke clears. It talks about post traumatic stress disorder, survivor's guilt, and a host of related subjects. I particularly liked the section on the Judeo/Christian views of killing which really help warriors understand and come to grips with their actions in battle - be it on the field of war, a city street, or even in their own back yard.

The research is great. The various vignettes and quotes are quite interesting. Even if you are never involved in a deadly encounter it really helps you understand and have a new appreciation for those who are. I have several friends and relatives in the military as well as a few in law enforcement. This book is going to be one of their holiday presents. This compelling study isn't just for professional warriors, however. Anyone with an affinity for martial arts like myself will find it an excellent read as well.

Lt. Col. Grossman is a retired U.S. Army Ranger, scholar, and the Pulitzer nominated author of On Killing, another great book. Loren Christensen is one of my favorite martial arts authors. A retired police officer, Vietnam veteran, and 8th dan black belt he really knows his stuff. Gavin DeBecker who writes the foreword is an expert on preventing violence and author of The Gift of Fear, the definitive work on that subject.

Lawrence Kane
Author of Surviving Armed Assaults and Martial Arts Instruction; co-author of The Way of Kata, The Way to Black Belt, and The Little Black Book of Violence



5 out of 5 stars A MUST read for all "warriors".   March 26, 2005
G. S. Winchell (San Diego)
256 out of 280 found this review helpful

This book explores in detail what physically and mentally happens to most people when confronted with a deadly threat. Both authors have written previous books dealing with this subject. This collaboration brings together the best both have to offer.

Col. Grossman has an extensive military background as a member of the Army Rangers. His book, On Killing, was written over a decade ago and is still one of the definitive words on the subject. Through research and interviews, Col. Grossman was able to open a window into the soul of a "warrior" and explain why even when directly threatened, it is not a simple thing to take another human beings life.

Loren Christensen is a former police office and co-author of another excellent use of force book, Deadly Force Encounters. That book focused on law enforcement experiences with lethal force. Again through interviews and research, Christensen, and his co-author Dr. Alexis Artwohl, gave a human face to the peace officer forced to kill.

On Combat combines the world of the military combat veteran with that of the police officer. The authors contention is that both are worthy of the term "warrior". The "warrior" is the 1% who protects the 98% from the remaining 1% who would do them harm.

The book is divided into four sections. Each section deals with a different aspect of combat but always from the perspective of how a human deals with combat.

The first section is titled, "The Physiology of Combat: The Anatomy of the Human Body in Battle". The authors describe a basic element of combat as the "Universal Human Phobia". That phobia is the innate human aversion to killing one of their own. With only a small percentage of the population as an exception, human beings will find it difficult to take another human's life in a face to face confrontation.

Equally as important to understand is the body's reactions to being attacked. Interpersonal human aggression creates a "toxic and corrosive" atmosphere in the daily work of warriors everywhere. Our bodies will respond in ways that we may not be able to control but must understand nonetheless if we are to competently handle a lethal threat. Automatic systems designed for thoughtless survival kick into gear. Adrenaline is released, digestive processes cease and even bladder and sphincter control is lost. These are things to prepare for and not be surprised should they happen.




The automatic systems in place are the sympathetic (SNS) and parasympathetic (PNS) nervous systems. The SNS arouses use to action when necessary and the PNS works to regain control and establish a balance in your body. The snapping back of your body from the arousal to an attempt at normalcy can be a dangerous condition. Napoleon said, "The moment of greatest vulnerability is the instant immediately after victory." It may not only be a physical collapse but also a dangerous mental collapse as well.

Maintaining good sleep habits, which would include a minimum of 7-9 hours of uninterrupted sleep, is very important to aid in the bodies' maintenance. Less than that places unneeded stress on the body. There is an amount of stress is actually beneficial, however, that is caused by increasing your heart rate. The increase must be caused by SNS arousal. Heart rate increases caused by exercise will not have the same effect. The authors emphasize that the numbers are not precise and different people will have different experiences depending on factors such as training and physical fitness levels.
Of particular interest is the fact that it appears that an hormonal induced heart rate of 115-145 bpm produces an optimal level of performance in those skills most necessary for combat and survival. Complex motor skills, visual reaction time and cognitive reaction time are all at their peak.

The reason for bringing this information to the reader's attention is to emphasize the importance of realistic and stressful training which can create almost an "autopilot" response to a deadly threat. It is also important not to allow your heart rate to climb too much higher than 145 bpm. Generally, your skill level and reaction times begin to deteriorate when heart rates go beyond 145 bpm.

One major way to combat stress and its negative effects is through tactical breathing. The authors describe that there are only two autonomic nervous system actions you can consciously control; breathing and blinking. Of the two, controlling your breathing will be of great benefit during a stressful situation. You can decrease your heart rate by practicing tactical breathing. The breaths should be deep `belly breaths', that is, during inhaling, your stomach expands like a balloon. Each step is done while mentally counting to four. The four simple steps to this breathing are:
In through the nose, two, three, four.
Hold two, three, four.
Out through the lips two, three, four.
Hold two, three, four.

This tactical breathing sequence is most effective when repeated at least four times.

Section two of the book discusses the possible perceptual distortions that may occur during a lethal force encounter. The authors use information collected by Dr. Alexis Artwohl and Loren Christensen in preparation for the writing of their book, Deadly Force Encounters. The findings were based on a survey of 141 officers. These findings described the most common distortions that occurred.

Perceptual Distortions in Combat
85% Diminished sound (auditory exclusion)
16% Intensified sounds
80% Tunnel vision
4% Automatic pilot ("scared speechless")
72% Heightened visual clarity
65% Slow motion time
16% Fast motion time
7% Temporary paralysis
51% Memory loss for parts of the event
47% Memory loss for some of the subject's actions
40% Dissociation (detachment)
26% Intrusive distracting thoughts
22% Memory distortions


It is important to note that some people may have experienced more than one type of distortion while others experience none at all. Again, having knowledge of a possible experiential distortion will prepare an officer for its occurrence, thereby providing an `inoculation' against its effects.

Section three describes the mental attitude necessary to be a warrior. The book goes into greater detail about stress inoculation and its importance to effective, realistic training. There are also some important training principles outlined.

Principle 1: Never "Kill" a Warrior in Training. Learners are expected to complete a scenario even if hit, stabbed or shot. As a trainer, tell them, "You're not dead until I tell you you're dead!" Don't give up, always win.

Principle 2: Try to Never Send a Loser off Your Training Site. Have your participants go through a scenario as many times as necessary in order to have them succeed. Scenarios designed to make the trainee look foolish or fail just prove that the training designers are jerks.

Principle 3: As a Trainer, Never Talk Trash about Your Students. Don't ridicule or try to tell funny stories about the last trainee who tried to complete your scenario. Your role as a trainer/leader is not only to pass along knowledge but also to inspire. You cannot do this when you are not respected. If criticism is to be given, give it in private. If praise is warranted, do so publicly.

Encourage your learners not to worry over a `bad' day of training. Fix the problem, correct the deficiency, strive to improve and move on.

The will to do the job (kill if necessary) is sometimes enough to change a situation from one of having to use lethal force to something less. The determination to perform the ultimate act may be perceived by the intended recipient of your force and in itself be enough to deter their actions. If you've got that steel-eyed certainty in your eyes, the bad guy may not wish to actually test your resolve. You are the weapon; everything else is just a tool.

Your resolve to succeed must include the possibility of losing some blood. You can loose a half-gallon of blood and your body will continue to mechanically function. Ceasing to fight before that much blood is lost is due to a lack of will, not lack of hydraulics.

You need three very simple things in order to survive a lethal encounter; the right weapon, the skill to use that weapon, and the mental decision to use that weapon, even if it means that someone may die. This decision must be made well in advance of a time during the confrontation with the deadly threat. At the time you are confronted with violence is not the time to wonder whether or not you can respond with deadly force if necessary.

The remaining chapters in this section discuss the history of weaponry (and its effect on combat), and some superior reasoning for the increase in school violence. Although both subjects were interesting, I chose not to include them in this review since my emphasis was on the mental and emotional preparation for deadly force use.

The fourth and last section of the book deals with the aftermath; what does a person feel like after they have taken a life. One of the most common reactions expressed is relief, "Better him than me". This feeling can often lead to guilt of sorts, "Why did he make me kill him". Although the feeling of relief is perfectly natural, allowing that to progress into guilt is not. After all, winning a deadly force encounter is certainly cause to feel happy about being alive.

The authors contend that there are ways of handling an emotional upheaval such as having to kill someone. First, you cannot act like it did not happen. You should talk about it, preferably with a mental health professional. Second, after a year or so has passed, you should not be unduly affected emotionally by remembering the event. As the authors put it, "The memory must be separated from the emotion." If the fear of the repeat of such an event has a significant negative impact on your day to day life you should seek the help of a mental health professional. Examples of this could include; not being able to go near the area an event occurred without feeling anxiety or having nightmares about the event.
The critical incident debrief is also an excellent way to assist personnel in getting through what can be an emotionally tough time. By debriefing we can reconstruct the event in hopes of finding out what worked and what didn't. We can also fill in the holes (if any exist) by bringing all involved parties together and thereby get a much better overall view of the incident. A positive emotional side-effect of this is that pain shared with others is divided amongst the group and not the sole burden of any one person. Additionally, joy shared is multiplied and everyone can feel better at another person's accomplishment and success.

Another important way to assist is simply by letting your friend or loved one know that you are glad they are O.K. It is not necessary to try and approve or justify their actions but just let them know that you are happy that they're O.K. An offer of your personal time to listen or help with anything else they might need would go far in letting them know how important that they are.

One of the last points to be made in this book is the idea of justice not vengeance. Although not considered to be a major problem in law enforcement, it is nonetheless important to emphasize that killing, when justified and necessary, is not something to be glorified or celebrated. It is just something that is. When forced to kill another human being is not something we do with a hatred of the crook or glee at their demise. We just do it. We must strive to dispassionately but effectively protect others as well as ourselves.

Steve Winchell is a 27 year veteran of southern California law enforcement. He has been a firearms instructor for the past 9 years. For the past 3 years he has been a full time member of the San Diego County Sheriff's Department Weapons Training Unit.



5 out of 5 stars A Must Read For All Cops & Soldiers   May 27, 2005
Daniel L. Bender (Durango, Colorado)
28 out of 29 found this review helpful

After reading "ON COMBAT", I bought 2 more copies for relatives in law enforcement and another 8 copies for the Sheriff's Office I work for. As a person with over 25 years in law enforcement and a tour in Vietnam, I highly recommend this book for anyone in law enforcement, the military, and their families.

It not only provides a wealth of information on surviving deadly force encounters, both physically and mentally, but it does so in a very easy to read format. Everyone I loan my copy to says they hate to put it down once they start it.

The book contains many insightful first-hand accounts from people who have been in deadly force encounters.

I was so impressed with the book, I added a 1 hour segment to my law enforcement 1st Aid /CPR courses to share highlights from "On Combat" with my fellow officers because it offers much that can enhance their safety and their well being.

The section dealing with the influence of violent video games on our children and their desensitization to violent behavior is something every parent should know.

If you are a cop, a soldier, or a trainer of either, this book should be required reading!




5 out of 5 stars Survival Training: Mind and Body   February 23, 2005
Scott Blackledge (Albuquerque, NM, USA)
13 out of 13 found this review helpful

Lt.Col. Grossman has written an exemplary work on the realities of combat. This is another must read for those who go " . . . willingly into the heart of darkness, into the toxic, corrosive, destructive realm of combat." Lt. Col. Grossman incorporates many of the old studies with new research to give us a better understanding of what to expect, and what to do, during combat. He presents it in a manner which is easy to comprehend, yet interesting to read.

For more than 25 years I've worked in and studied this field, and reading Lt. Col. Grossman's book has helped to put all those years of experience and training into a better perspective. All new "warriors" should read this book before picking up a weapon and heading out onto the streets or into the bush. They must be prepared mentally, as well as physically, and must ask themselves if they can do this. Only then would they be ready for what they will experience.



5 out of 5 stars A Non Warrior's Review   May 7, 2007
Steve Dietrich (Santa Ynez Valley and Santa Monica CA, United States)
26 out of 30 found this review helpful

Many of the prior reviews were from those who go into danger to protect our nation and our neighborhoods. Their universal acclaim speaks volumes about the quality and integrity of Grossman's work in providing the tools to perform, sruvive and return.

On another level the book provides the average citizen the start of an understanding of how much different combat ( in Iraq and the liquor store holdup gone wrong) is different from what we see on TV, read in the papers and hear from those "professionals" who regularly review the performance of those who were engaged in combat. The book is a true eyeopener. On a personal level the book helped me understand what happened, how through chance I survived an armed robbery /kidnaping gone wrong.

For the concerned citizen the book serves another purpose and that is to validate Grossman's credentials to have written Stop Teaching Our Children To Kill. Sadly Grossman was not called upon to appear on TV during the non-stop coverage of the Virginia Tech killings. Perhaps the reason the book does not get the coverage it deserves is the direct and indirect threat it poses to much of the media.

Both On Combat and Stop Killing Our Children are great contributions and highly recommended.


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