Melee Attacks in the Heroes IV card game. Making Melee Attacks: To make a Melee Attack, your unit must be on the Melee Line. He selects a target on the opponent’s Melee Line and rolls a die. Add the die roll to your Unit’s Melee Attack Score. If the result is at least equal to the target’s Defense Score, you have killed the enemy unit. Remove the top card from the enemy stack. If your Attack Score + die roll was less than the target’s Defense Score, you have failed to harm the target stack.