 After the Commando headquarters group had landed , Commander Ryder went to check for himself that Campbeltown was firmly stuck in the dock . Some of her surviving crewmen were being taken on board the MGB . Ryder returned to the boat and ordered the MTB to carry out its alternative task and torpedo the lock gates at the old entrance to the basin . After a successful torpedo attack , Ryder ordered the MTB to leave . On their way out of the estuary they stopped to collect survivors from a sinking ML and were hit and set on fire . Back at the docks the MGB had positioned itself in mid @-@ river to engage enemy gun emplacements . The forward 2 pounder was manned by Able Seaman William Alfred Savage . Commander Ryder reported that 
