The Collaborative International Dictionary
On the warpath
Warpath \War"path`\, n.
The route taken by a party of Indians going on a warlike
expedition.
--Schoolcraft.
On the warpath, on a hostile expedition; hence, colloquially, about to attack a person or measure.
Wiktionary
on the warpath
a. (context idiomatic English) Very angry or upset.
Wikipedia
On the Warpath
"On The Warpath" is a popular instrumental tune composed by Raymond A. Browne in 1904. "On The Warpath" was the first American popular music to incorporate a repeating tom-tom effect in the score.