Kammala jumla mai zuwa: Gomm ya shiga rundunar Sir Arthur Wellesley, a matsayin mataimakin janar-janar, kuma ya yi yaƙi a
Yaƙin Roliça da Yaƙin Vimeiro a watan Agusta 1808 yayin Yaƙin Peninsular. Bayan Yarjejeniyar Sintra Gomm ya koma Portugal kuma ya yi aiki a kan ma'aikatan Sir John Moore a yakin Corunna a watan Janairun 1809. Gomm kuma yana cikin ma'aikatan Earl na Chatham a lokacin bala'in Walcheren Campaign na Autumn 1809.