The crest shows a lion, which despite its tincture is supposed to be the English lion, obvious as it is crowned with an imperial crown.
The upper fly (right) quarter represents Britain, which controlled the fort from 1760 to 1796; it has three gold lions on a red field, imitating the Royal Arms of England.
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The arms are Courtenay impaling the arms of his wife's father as Duke of York: Quarterly 1st: Royal arms of Lionel, Duke of Clarence; second and third, Elizabeth de Burgh, 4th Countess of Ulster; fourth, Edmund Mortimer, 3rd Earl of March.