A battle cry or war cry is a yell or chant taken up in battle, usually by members of the same combatant group. Battle cries are not necessarily articulate, although they often aim to invoke patriotic or religious sentiment. Their purpose is a combination of arousing aggression and esprit de corps on one's own side and causing intimidation on the hostile side. Battle cries are a universal form of display behaviour aiming at competitive advantage, ideally by overstating one's own aggressive potential to a point where the enemy prefers to avoid confrontation altogether and opts to flee. In order to overstate one's potential for aggression, battle cries need to be as loud as possible, and have historically often been amplified by acoustic devices such as horns, drums, conches, carnyxes, bagpipes, bugles, etc..

Dieu et mon droit, which means 'God and my right', is the motto of the monarch of the United Kingdom. It appears on a scroll beneath the shield of the version of the coat of arms of the United Kingdom. The motto is said to have first been used by Richard I (1157–1199) as a battle cry and presumed to be a reference to his French ancestry and the concept of the divine right of the monarch to govern. It was adopted as the royal motto of England by King Henry V (1386–1422) with the phrase "and my right" referring to his claim by descent to the French crown.