Green’s Dictionary of Slang

Mace n.

[the prize-fighter Jem Mace (1831–1910)]

(Aus.) physical violence.

[Aus]Bulletin (Sydney) 21 Mar. 22/2: If, at times, when they’ve let all the truth out, / And called us hard names to our face, / We have playfully knocked an odd tooth out, / And generally given ’em Mace.