Marshalls book is highly controversial when it was published and has been cited by many respected historians. It wasnt until Dr. Roger Spiller did a study on Marshalls claims did anyone realize there was a problem.
Here is a link with a brief of Dr. Spillers results. I personally dont know who is right but I do know Marshalls book is not accepted by some military historians and sociologist.
http://www.warchronicle.com/us/comba...rshallfire.htm