 West Cheswald departed Boston on 10 March and arrived at Halifax two days later . Departing from that port on 29 March , she sailed in Convoy SC @-@ 156 and arrived at Swansea on 14 April . She departed there on 30 April for Oban , where she joined the assembling " Corncob Fleet . " The Corncob Fleet was the group of ships to be sunk to form the " gooseberries " , shallow @-@ water artificial harbors for landing craft . Poropat reports that once the ship crews were told of their mission while anchored at Oban , they were not permitted to leave the ships . After five weeks of isolation at anchor , West Cheswald headed south for Poole , to join the first corncob convoy . 
