What is tally ho meaning?

Tally ho is a hunting phrase that originated in England and is used as a call to alert hunters that a fox has been spotted and the chase is about to begin. It is also used to announce the sighting of any other game to be hunted. The phrase has since taken on a broader meaning and is used to indicate excitement or a call to action. In military contexts, it assumes the meaning of "let's go" or "charge" or "forward!"