Last night, I played Yakyuken with my friends.

Kenji is my best friend.

The enemy aircraft invaded our airspace.

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.