The offshore squadron at first conducted the attack while underway .
This proved difficult , and by 9 : 40 , Sultan , Superb and Alexandra had anchored off the Lighthouse Fort and concentrated their fire on Ras - el - Tin .
The offshore squadron at first conducted the attack while underway , but this proved difficult , and by 9 : 40 , Sultan , Superb and Alexandra had anchored off the Lighthouse Fort and concentrated their fire on Ras - el - Tin .