敵がこちらに近づいたら発砲するんだぞ。の英語

Bring the guns into play when the enemy approaches us.

The enemy fired at random in the dark.

The enemy fled in disorder from the battlefield.

We anticipated where the enemy would attack.

They were ready to run the risk of being shot by the enemy.

We fired guns at the enemy.

We fell in with the enemy, and routed them―put them to the rout.

The enemy answered our fire.

The enemy were hiding behind some bushes.

If we act carelessly, we'll play into the enemy's hands.

They took potshots at the enemy.

The enemy approaches the town.

The enemy finally gave in.

a redoubtable opponent [enemy]

take cover from enemy fire

The enemy fired at random in the dark.

the enemy catapulted rocks towards the fort

They were exposed to the enemy's gunfire.

The enemy attacked us in great force.

The enemy is caught like a mouse in a trap.

They returned the enemy's fire desperately.

drop bombs on an enemy position

The enemy occupied the fort.

The enemy were crushed at a blow.

As they fight together, they gradually learn how to defeat their enemies.

It was heroic of them to oppose the enemy.

Friend and foe mingled pell-mell―It was a mixed fight―a mêlée.

Incomprehensibly, the enemy stopped their attack.

We were harassed by a galling fire.

It's not as though we were enemies at each other's throats.