An American term for the ancient practice of soldiers to register lethal disapproval of members of their own side with whatever comes to hand. In Vietnam this was the fragmentation grenade, from which the word is derived.
The historical incidence of the phenomenon cannot be known. On the one hand leadership from the front exposes the backs of officers to malcontents in their own ranks, but on the other the higher risks thereby incurred tend to strengthen the hope that the enemy may do the job. A classic illustration is the fate of a hated major at Blenheim, whose grenadiers punctiliously granted his request to take his chances with enemy bullets, and only shot him after the battle was over. A variant was the killing of the Anarchist Durruti during the Spanish civil war, by men who could no longer stand to be shamed by his suicidal bravery.
There have been groups of fighting men throughout history whose religious or cultural sensibilities were ignored by officers at their peril. The largest ‘fragging’ incident in history was the Indian Mutiny, provoked by just such a failure on the part of the East India Company, and while the empire lasted British officers of Arab, Sikh (see Sikh wars), or high-caste Hindu regiments who struck their men were regularly murdered. As a general rule the more intrinsically warlike peoples are the ones most likely to avenge offences against their honour without regard to subsequent punishment. Attempts to harness the energy of violently antisocial individuals for war have included the French and Spanish Foreign Legions and the Nazi and Soviet penal battalions of WW II, but the downside of this from the disciplinary point of view is self-evident.
Something more akin to vengeful despair was at work towards the end in Vietnam among those unwillingly in uniform and unwilling to be the last to die in a by-then pointless war. The system of exemptions told draftees that their society did not value them, long before this was made patent on their return home when they were spat upon by the exempt. Racial tensions in the greater society were magnified in the field, and the traditional glues of group pride and of winning honour among peers were perversely diluted by the posting of soldiers as individuals and the profligate award of medals to non-combatants. It is unremarkable that in excess of 1, 000 officers and NCOs were fragged.
— Hugh Bicheno




