Loudon at New York was engaged in a controversy with the government of Massachusetts concerning the quartering of British troops, and threatening to send an army to that province if his demands were not speedily complied with, and so the campaign ended without honor or advantage to the English. Its poor results were chiefly due to the inefficiency of the British ministry, and the incapacity of the British commanders to carry on this unaccustomed warfare of the wilderness, and their unwillingness to avail themselves of the experience of the colonial officers, whom they despised, thus leaving to their alert and active enemy all the advantage of familiarity with its methods. So universal was the complaint in England and her American colonies caused by this and the preceding campaigns that the formation of a new ministry became necessary, and William Pitt was appointed secretary of state. In his plan of the American campaign, which was soon to be vigorously undertaken, one army of 12,000 men was to attempt the conquest of Louisburg; another, still larger, that of the French forts on Lake Champlain; and a third, that of Fort Du Quesne, at the head of the Ohio River. The expedition against Louisburg was commanded by General Amherst, under whom were Generals Wolfe, Whitmore, and Lawrence. The naval force, commanded by Admiral Boscawen, sailed for America early in the spring, and in May, 1758, the whole armament of 157 sail was gathered at Halifax. Sailing thence on the 28th, a part of the transports arrived near Louisburg, and on the 8th of June the troops, under General Wolfe, disembarked and invested the city. Louisburg was garrisoned by 2,500 regulars, 300 militia, and later by a reinforcement of 350 Canadians and Indians, and the harbor was defended by 11 French ships of war. After a siege of several weeks, during which the French warships were destroyed, the place surrendered to General Amherst on the 26th of July. In the beginning of the same month General Forbes set forth from Philadelphia on his difficult march to Fort Du Quesne. Obstacles which delayed and reverses which checked his progress did not discourage him, although he was so debilitated by a mortal sickness that for much of the distance he was carried on a litter; and in November he took possession of the fort, which had been dismantled and abandoned by the French, and gave it the name of Fort Pitt.