relieve guard

A squad of Apparatus troops marched by, relieving guards and replacing them.

It turns off toward Jordan Field to post and relieve guards at the hangars, which takes a while.

Not a single native was visible; only the watchful sentinels relieving guard at the door of the Ware-Atoua.

Each fresh guard took his assigned place; each relieved guard left his position to join the others in exactly the same formation as those who had arrived.

The relieving guard marched in from the direction of Governor's Walk, exchanged salutes and passwords with the imperial troops, and formed up in the centre of the courtyard.