This is when the Avenger grabbed his cape, mask and truncheon and got involved.
From the time.com
Some 20 truncheon-wielding Roma youths beat up six young white men outside a disco.
From the economist.com
Bill Greenaway had his wrist fractured after, he claimed, it was hit with a truncheon.
From the guardian.co.uk
Much more effective than chanting outside en masse and being beaten with a truncheon.
From the guardian.co.uk
He tried to leave, but a young cop raised his truncheon to strike him.
From the time.com
A truncheon is clearly visible in the picture, poised above a figure wedged against a wall.
From the guardian.co.uk
Along with handcuffs and a truncheon, bobbies on the beat may soon carry a radar flashlight.
From the newscientist.com
The device looks like an ordinary truncheon or nightstick baton, with a handle on one side.
From the newscientist.com
If the higher ups don't have a sense of humour they will be on the other end of the truncheon.
From the economist.com
More examples
A short stout club used primarily by policemen
A truncheon or baton (also called a cosh, Paddy wacker, billystick, b'tawn, billy club, nightstick, sap, blackjack, stick) is essentially a stick of less than arm's length, usually made of wood, plastic, or metal, and carried by law-enforcement, corrections, security, and (less often) military ...
A fragment or piece broken off from something, especially a broken-off piece of a spear or lance; The shaft of a spear; A short staff, a club; a cudgel; A baton, or military staff of command, now especially the stick carried by a police officer; A stout stem, as of a tree, with the branches ...
(trun'shun) A baton, or staff of authority.
N. The baton used by policemen to... umm... quieten people down a little. This reminds me of a story (which might be an urban myth) told to me - at exactly the same time as one US police force lost the nightstick because it was regarded as overly violent, they were all issued with full-sie ...