The Legion of Frontiersmen was formed in 1905 as a volunteer force to act on behalf of the Crown, particularly along the frontiers of the British Empire. Prince Louis of Battenberg was a founding member, and they helped raised and fill the ranks of Princess Patricia's Canadian Light Infantry in the First World War (to whom Lady Mountbatten was appointed Colonel-in-Chief in 1974). Lady Mountbatten was appointed Patron of the Legion of Frontiersmen in 1983, and in a letter to Brigadier Fitchette she discussed that although she had reached a point where she couldn't accept more commitments, the two aforementioned connections were "excellent reasons to make me accept your invitation".