Kammala jumla mai zuwa: Hamilton ya shiga cikin sojojin Birtaniya a ranar 28 ga Fabrairun 1755 kuma an ajiye shi a Portsmouth. Ya fara aiki a watan Yunin 1756 a
Siege na Fort St Philip, wani ɓangare na Yakin Shekaru Bakwai. An sanya shi zuwa 34th Regiment of Foot, yana ɗaya daga cikin sojojin Burtaniya 2,800 da ke yaƙi a ƙarƙashin umurnin William Blakeney a kan Faransawa 15,000 a ƙarƙashin Duke de Richelieu da Roland-Michel Barrin de La Galissonière. Faransanci ya tashi zuwa Fort St. Philip kuma ya tilasta wa Birtaniya su mika wuya. A lokacin kewaye, Admiral John Byng ya yi tafiya a can tare da ƙungiyar agaji, yana fatan ya ceci tsibirin ga Birtaniya, amma bai yi nasara ba. Faransanci ya kashe ko ya ji rauni 400 Birtaniya a nasarar Faransa.