 The three destroyers and 16 small boats left Falmouth , Cornwall at 14 : 00 on 26 March 1942 . They formed into a convoy of three lanes , with the destroyers in the middle . On arrival at St Nazaire the <unk> MLs were to head for the Old Mole to disembark their Commandos , while the starboard lane would make for the old entrance to the basin to disembark theirs . Not having the range to reach St Nazaire unaided , the MTB and MGB were taken under tow by Campbeltown and Atherstone . 
