1
general::
Furious and on a hostile course of action, as in When the meat wasn't delivered, the chef went on the warpath. This expression was an English translation of a Native American term that literally means "a path used by a war party." Go on the war path thus meant "go to battle." It was used in this way by James Fenimore Cooper in The Deerslayer (1841); its present hyperbolic use dates from the late 1800s.
American Heritage Idioms
2
general::
Phrase(s): on the warpath
very angry. • The boss is on the warpath again. Watch out! • I am on the warpath about setting goals and standards again.
McGrawhill's American Idioms And Phrasal Verbs