The way this game works is you post a picture, painting, representation, or other art form that depicts a battle, then we have to determine which particular battle it was. Those who guess correctly then get reputation and get to post their own battle depiction. Representations do not have to be contemporary with the battle itself. I will start with an easy one:
Guess! Hint: take note of the symbolic imagery, particularly the combatants, the knight, and the cross.