The following year, Johnson relocated with Loyalist supporters to Canada as tensions rose in New York during the American Revolution.
On 1763, Guy Johnson married William's daughter Mary (Polly), one of his children by his first consort, Catherine Weisenberg.
Guy Johnson became a deputy to Sir William in his uncle's position as British Superintendent of Indian Affairs.
Johnson decided to travel to England in November 1775, accompanied by the Mohawk leader Joseph Brant, to appeal his case directly with the British lords.
[3] The Lords appointed Johnson as the permanent superintendent for Indian affairs in the northern colonies, but with no authority in Canada.
Back at Fort Niagara in 1779, Johnson helped to provide for the many Iroquois refugees made homeless by the Sullivan Expedition that year, which laid waste to their villages and food stores in western New York.
In 1781, General MacLean reported that Johnson's wartime accounts were "Extravagant, wonderful & fictitious, and the quality of articles so extraordinary, new & uncommon".
[citation needed] Johnson was suspended as superintendent and summoned to Montreal, where the governor-in-chief, Frederick Haldimand, criticized his conduct as "reprehensible".
Sir John Johnson took over Fort Niagara as superintendent of Indian affairs in his cousin's absence; he was officially appointed to the position in March 1782.
Recently used as the Walter Elwood Museum for local history, it was severely damaged in late August 2011 by the flooding caused by Hurricane Irene.