The outbreak of the Seven Years’ War once again caused him to return to active duty, and in July 1762, he was chosen to lead an assault on Havana. The siege was extraordinarily successful, inflicting 11,670 casualties on the Spanish in return for British casualties being under half of that number. In addition to the capture of the second capital of the Spanish Empire, 10 ships of the line, 2 frigates, 2 sloops and 100 merchant ships were captured. The humiliating Spanish defeat helped end the war in the favour of the British.