We are ready to invade enemy territory.

The enemy general is approaching our camp.

He encountered the enemy on the battlefield.

He experienced his first encounter with the enemy on the battlefield.

Enemy troops are approaching our position.

He moved agilely to avoid the enemy bullets.

We are conducting training to devise strategies against hypothetical enemies.

He said, 'If you want to shoot a man, first shoot his horse,' and began to solve the smaller problems first.

This atomic bomb uses an implosion method.

The star implodes and becomes a black hole.