Green’s Dictionary of Slang

(US) to plunder.

1862		Yankee Volunteer’s Songster 71: His knapsack with chickens was swelling; He’d ‘Blenker’d’ those dainties, and thought it no wrong.... (Note. ‘Blenkered,’ . . . a term quite common, just now, in the army for anything stolen, which came into use soon after General Blenker’s division passed down the Shenandoah Valley.) [DA].
1890–1904		Farmer & Henley Sl. and Its Analogues.