Given Nairne's lack of prospects back in Scotland, he decided to remain in Canada, and in 1762 he received, along with his friend Malcolm Fraser, the seigneury of La Malbaie, with Fraser taking Mount Murray and Nairne receiving Murray Bay and a section of Charlevoix, Quebec.
Although Nairne happened to be an excellent farmer, it was difficult to turn a profit off the land he had acquired and many of his requests for funding (such as asking for a road to be built) were left unanswered.
Eventually, he would have five more children with Christina Nairne, building a large manor house for his family and continuing his work in the settlement.
In 1775, with an American invasion imminent, Governor Guy Carleton charged Nairne with organizing a regiment from his seigneury and the surrounding communities.
During his military career, Nairne fought at Montreal, Quebec and Île aux Noix,a small island located on the Richelieu River, near to Lake Champlain.
Given that this value is being affected by the current global pandemic (2022), consideration should be given to that amount paid while keeping in mind the pros and cons of an economy impacted by war.