hew ▁of ▁G av eston ▁with ▁the ▁same ▁name , ▁Ber tr and ▁de ▁Ca ill ou , ▁was ▁working ▁to ▁secure ▁G av eston ' s ▁position ▁in ▁early ▁ 1 3 1 2 . ▁King ▁Edward , ▁like ▁his ▁father ▁Edward ▁I , ▁as ▁Duke ▁of ▁Aqu itaine , ▁used ▁men ▁such ▁as ▁Ca ill ou , ▁drawn ▁from ▁his ▁French ▁f ief s ▁in ▁his ▁Scottish ▁wars ▁especially ▁to ▁man ▁the ▁front ier ▁in ▁such ▁Cast les ▁such ▁as ▁Ro x burgh ▁and ▁Ber wick . ▁ ▁In ▁some ▁sources ▁Ca ill ou ▁is ▁described ▁as ▁the ▁governor ▁of ▁Ber wick ▁Castle , ▁but ▁the ▁governor ▁at ▁that ▁time ▁was ▁Sir ▁Maurice ▁de ▁Ber keley ▁It ▁is ▁more ▁likely ▁that ▁Ca ill ou ▁was ▁the ▁Captain ▁of ▁the ▁Gas con ▁troops ▁within ▁ ▁the ▁g arrison . ▁ ▁In ▁ 1 3 1 5 ▁the ▁har vest ▁failed ▁in ▁southern ▁Scotland ▁and ▁Northern ▁England ▁and ▁by ▁winter ▁the ▁g arrison ▁at ▁Ber wick ▁was ▁at ▁such ▁extrem ity ▁that ▁they ▁were ▁forced ▁to ▁eat ▁their ▁horses , ▁and ▁was ▁being ▁affected ▁by ▁desert ion . ▁Ca ill ou ▁and ▁others ▁of ▁the ▁Gas cons ▁suggested ▁a ▁ra id ▁into ▁Sc ots ▁held ▁territory ▁to ▁re pl en ish ▁the ▁stores ▁of ▁the ▁Castle , ▁Ber keley ▁refused ▁his ▁permission ▁as ▁the ▁coun tr ys ide ▁was ▁full ▁of ▁Sc ots ▁soldier y , ▁and ▁his ▁main ▁commission ▁was ▁the ▁defence ▁of ▁the ▁town ▁and ▁castle ▁of ▁Ber wick . ▁Ca