 The Commandos on Campbeltown now disembarked : two assault teams , five demolition teams with their <unk> and a mortar group . Three demolition teams were tasked with destroying the dock pumping machinery and other installations associated with the dry dock . The <unk> @-@ wearing Captain Donald Roy - ' The Laird ' - and his 14 @-@ man assault troop were tasked with <unk> two pump @-@ house roof @-@ top gun emplacements high above the <unk> and securing a bridge to provide a route for the raiding parties to exit the dock area . Roy and <unk> Don Randall used scaling <unk> and grenades to accomplish the former , and a head @-@ on rush to secure the bridge and form a bridgehead that enabled <unk> Bob Montgomery and Lt Corran <unk> and their demolition teams to exit the area . 
