The bank guard alerted the police when he noticed suspicious activities.

He firmly held the handle of the sword.

Every evening, I look after my neighbors' children.

In the Middle Ages, the avant-garde was essential to protect the main army from surprise attacks.

He stood ready in defense against any attack.

Be on guard against false friends.

He takes en garde before the duel.

On guard! Ready? Go!

The quartermaster is responsible for managing the supplies.

The gamekeeper watches over the forest and protects the wildlife.