To define a battlecry we can use the following unless someone has a better definition:
A battle cry is a yell or chant taken up in battle, usually by members of the same military unit. The content and nature of battle cries vary, depending on whether their intent is to threaten, invoke a family name or family lands, or call on God for assistance. These cries can serve many purposes, including inspiring those otherwise inclined to stay back, terrifying the enemy, promoting a sense of esprit de corps, as well as communicating to allies that they have support.
I have accumulated a few:
Remember the Alamo - One of the most famous battle cries in the Mexican-American War.
Banzai! - Used by the Japaneese during WWII
Currahee! - Used by the 506th Parachute Infantry Regiment
