to subdue the enemy―subjugate the enemy―reduce the enemy to subjection―bring the enemy to his knees
the circumstances of an enemy
close with the enemy
to go against the enemy―advance against the enemy―march against the enemy―send an army against the enemy
to press the enemy hard―press the enemy close―close with the enemy―come to close quarters with the enemy―bear down upon the enemy
敵になる
to become an enemy―turn against one
to attack the enemy―make an attack on the enemy―deliver an assault on the enemy