surprise attack
coup de main

So, if things go wrong, you can start a surprise attack from the inside.

"I should not like to be the first one to hear of a surprise attack."

It was better to meet him with a surprise attack.

This might be my last chance for a surprise attack, she thought.

At any moment, now, he could begin a surprise attack.

At any time, he might make a surprise attack through one of the windows.

All was quiet again after the first fire of the surprise attack.

Tonight, he would have the advantage of a surprise attack.

That was always a favorite hour for a surprise attack.

We thought they'd intended to get close enough for a surprise attack.