at the beginning of combat on your turn, battering ram gains banding until end of combat. (any creatures with banding, and up to one without, can attack in a band. bands are blocked as a group. if any creatures with banding you control are being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's blocking.)

whenever battering ram becomes blocked by a wall, destroy that wall at end of combat.