Alexander Cosby (c. 1685–1742) was born in Ireland and had a younger sister who married Richard Philipps, governor of Nova Scotia and a military man.
Through this connection, Cosby was appointed major in the 40th regiment and was stationed in Nova Scotia around 1721.
Cosby refused to follow orders given by Armstrong and also was appointed lieutenant governor of Annapolis Royal in 1727 by Philipps to succeed John Doucett.
It appears that Cosby was always in some kind of turmoil within the military and the governing body, a condition which continued until his death.
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