Locate the hidden men to get your men over the wall

Object of the game:

The attacking player must get at least one man over the wall. As he manoeuvers his men forward, some will move into the line of fire of various defenders and will be hit. By "sacrificing" some of his men in this way, he will try to learn the location of the defenders, and then still be in position to manoeuver one or more men over the wall.