Militarism was inseparable from imperialism in Britain, as in other imperialist nations, and its proponents saw schools as ideal means by which to give the nation's youth an early introduction to military drill. This book traces the history of military drill for pupils in elementary schools from 1870-1914.
It's a well-researched short piece. Not much surprise but it is useful. It reminds me that the whole school system (and society) was being militarized (really. not just "disciplining" but using rifles for training) much earlier than the Boy Scouts started and it was more widely debated by education specialists.