chamfrain

a warhorse, barded and chanfroned too: see Webster's Dict., s.v. "chamfrain". {also chamfron: armor for a horse's head}.

An Introduction to the Study of Robert Browning's Poetry Hiram Corson 1869

It was a work of no common difficulty or danger; a steed of less "mettle and bone" had long since sunk in the effort; as it was, the Baron's boots were full of water, and Grey Dolphin's chamfrain more than once dipped beneath the wave.

Half-Hours with Great Story-Tellers Various