When John Lees retired from business in 1791, they became agents for Alexander and George Davison, who were suppliers to the British troops in North America. Bell and Monro also managed the king's posts on the north shore of the lower Saint Lawrence River and, in 1793, held a share in the lease of the Saint-Maurice ironworks. In 1799, after the death of George Davison, they became sole holders of the lease of the ironworks.
When John Lees left his business in 1791, they took on roles as agents for Alexander and George Davison, who provided goods to British troops in North America. Bell and Monro also oversaw the king's postal services along the north shore of the lower Saint Lawrence River, and in 1793, held a stake in the lease of the Saint-Maurice ironworks. By 1799, after George Davison's passing, they became sole owners of the ironworks' lease.