In 1759, the British plan to defeat the French in North America aimed to cut off French supply routes along the Saint Lawrence River, block advances south through the Champlain Valley, and isolate interior forts by controlling the Niagara River. Its final phase in 1760 brought three British armies together to take Montreal, the seat of the French government on the continent. Brigadier General John Prideaux led the force against Fort Niagara, whose capture isolated French forts along the Great Lakes and in the Ohio River valley. Lieutenant Colonel William Haviland moved up Lake Champlain and the Richelieu River to join Amherst at Montreal, while British control of the mouth of the Saint Lawrence allowed Brigadier General James Murry to advance there as well. Major General Jeffery Amherst led the British armies to victory in North America, after earlier capturing Fort Carillon and Fort Saint Frederic in 1759. The wider campaign included earlier British victories and defeats, including the capture of Louisbourg, Fort Frontenac, Fort Duquesne, Quebec, Carillon, Saint Frederic, and Niagara, as well as losses at Oswego, Fort Bull, and Fort William Henry. In 1760, Amherst, with Murray and Haviland, surrounded Montreal and forced its surrender, ending the war in North America.