Rubuta ci gaba ga wannan sakin layi - Corbet ya shiga rundunar sojojin Birtaniya c.1745. A 1748 ya kasance Ensign a cikin 7th Regiment na Foot kuma a farkon Yakin Shekaru Bakwai an daukaka shi zuwa Kyaftin, yana tafiya tare da rundunarsa daga Ireland don taimakawa wajen sauƙaƙe Siege na Fort St Philip (1756)
a cikin Menorca. Taimakon ya gaza kuma rundunarsa ta koma Gibraltar inda ya yi aiki har sai rashin lafiya ya tilasta masa komawa Ingila.