The commandos on "Campbeltown" now disembarked. These comprised two assault teams, five demolition teams with their protectors and a mortar group. Three demolition teams were tasked with destroying the dock pumping machinery and other installations associated with the dry dock. The kilt-wearing Captain Donald William Roy – 'The Laird' – and his 14-man assault troop were tasked with knocking out two pump-house roof-top gun emplacements high above the quayside and securing a bridge to provide a route for the raiding parties to exit the dock area. Roy and Sgt Don Randall used scaling ladders and grenades to accomplish the former, and a head-on rush to secure the bridge and form a bridgehead that enabled Captain Bob Montgomery and Lt Corran Purdon and their demolition teams to exit the area.