its most significant action was an expedition organized by massachusetts governor william shirley that besieged Besieging and ultimately captured Conquering the french fortress of louisbourg , on cape breton island in nova scotia , in 1745 .

the treaty Sign_agreement of aix-la-chapelle ended Process_end the war Hostile_encounter in 1748 and restored Recovering louisbourg to france , but failed to resolve Resolve_problem any outstanding territorial issues .