The assailant is strangling his victim with a whip-thong; nearby is a typical roadside gallows with two highwaymen dangling from the cross-tree
(From the Newgate Calendar)

LIVES
OF THE
MOST REMARKABLE
CRIMINALS

Who have been Condemned and Executed
for Murder, the Highway, Housebreaking,
Street Robberies, Coining or other offences

Collected from Original Papers and
Authentic Memoirs, and
Published in
1735