Green’s Dictionary of Slang

to creep up on, to ambush.

1873		W.H. Thomes Bushrangers 65: ‘Gol darn their pictures!’ cried Hez, who had crawled on his stomach until he had struck a blow for my relief; ‘didn’t I Injun ’em that time?’.
1897		A.H. Lewis Wolfville 29: While she’s gone I injuns an’ spies ’round a whole lot.