▁of ▁Sand wich , ▁by ▁Maria . ▁He ▁was ▁bapt ised ▁at ▁St ▁Anne ' s ▁Church , ▁So ho , ▁West min ster . ▁William ▁is ▁thought ▁to ▁be ▁named ▁after ▁his ▁uncle , ▁William ▁August us , ▁who ▁died ▁at ▁Lis bon ▁in ▁ 1 7 7 6 . ▁His ▁grand father ▁was ▁John ▁Mont agu , ▁ 4 th ▁Earl ▁of ▁Sand wich , ▁who ▁served ▁three ▁terms ▁as ▁the ▁First ▁Lord ▁of ▁the ▁Admir alty , ▁to ▁ 1 7 8 3 . ▁ ▁Military ▁and ▁Parliament ary ▁Service , ▁and ▁Awards ▁Mont agu ▁joined ▁the ▁army ▁young , ▁going ▁to ▁sea ▁aged ▁ 1 1 ▁in ▁ 1 7 9 6 ▁as ▁a ▁volunte er ▁on ▁HMS ▁G lat ton ▁commanded ▁by ▁Captain ▁Henry ▁T rollo pe . ▁Mont agu ▁remained ▁with ▁T rollo pe ▁when ▁he ▁moved , ▁first ▁to ▁HMS ▁Russell ▁in ▁which ▁Mont agu ▁saw ▁action ▁at ▁the ▁Battle ▁of ▁Cam per down ▁and ▁subsequently ▁HMS ▁Just e . ▁In ▁late ▁ 1 8 0 0 , ▁Mont agu ▁was ▁commission ed ▁as ▁a ▁mid ship man ▁and ▁joined ▁the ▁fr ig ate ▁HMS ▁Si ri us . ▁In ▁Si ri us ▁he ▁was ▁present ▁at ▁the ▁capture ▁of ▁Dé da igne use ▁and ▁then ▁moved ▁into ▁the ▁brig ▁HMS ▁D ash er ▁for ▁four ▁years , ▁spent ▁in ▁the ▁West ▁Ind ies . ▁In ▁ 1 8 0 4 ▁Mont agu ▁returned ▁to ▁Europe ▁as ▁a ▁lieutenant ▁and ▁the ▁following ▁year ▁was ▁promoted ▁to