sentences:  Their advance would be covered by artillery fire against German shore positions from the heavy monitors at distance and at closer range by gunfire from the destroyers.This cover was vital because Ostend was protected by a very strong gun position known as the "Tirpitz" battery, named for the admiral.Once the operation had been concluded, the motor launches would draw along the seaward side of the blockships, remove the surviving crews and take them to the monitors for passage back to Britain.