The outbreak of the Seven Years' War in 1756 offered Wolfe fresh opportunities for advancement. His part in the aborted raid on Rochefort in 1757 led William Pitt to appoint him second-in-command of an expedition to capture the Fortress of Louisbourg. Following the success of the Siege of Louisbourg he was made commander of a force which sailed up the Saint Lawrence River to capture Quebec City. After a long siege Wolfe defeated a French force under the Marquis de Montcalm, allowing British forces to capture the city. Wolfe was killed at the height of the Battle of the Plains of Abraham due to injuries from three musket balls.