I imagine that the French and Indian War presented a lot of moral dilemmas for those who wanted to adhere to the so-called "Usages of War" that were generally accepted in Western Europe at the time. They were for organized armies fighting on the plains of Flanders, dress-right-dress and close it up, dress and cover. Wilderness fighting in America between two races was much more vicious and unforgiving.

During that war Col. Washington had to send a platoon up from his 1st Virginia Regiment to investigate the massacre of a family in the village where I live. The family was dead and just like in Vietnam the wily VC had once again gotten away. On the tactical level war in the raw leads men to do what works, not what abstract moral codes tell them to do. Some things are beyond the pale -- death camps and massacres -- but I imagine battlefield situations challenge accepted notions of right and wrong.