When Great Britain and the United States in 1859 agreed to a joint occupation of San Juan Island until the water boundary between the two nations could be settled, it was decided that camps would be located on opposite ends of the island.
Shortly after the British and American governments affirmed Lieutenant General Winfield Scott’s proposal to jointly occupy San Juan Island, the Royal Navy started looking for a home for its British Royal Marine Light Infantry contingent.
Capt. James Prevost, commander of H.M.S. Satellite, selected the site on Garrison Bay — 15 miles northwest of American Camp — from among seven finalists. He’d remembered the bay shore from explorations two years earlier as a part of the water boundary commission survey of the island. At that time, one of his officers, Lieutenant Richard Roche, had commented on seeing abandoned Indian plank houses nestled among a vast shell midden.
Roche described the ground as "well-sheltered, has a good supply of water and grass, and is capable of affording maneuvering ground for any number of men that are likely to be required in that locality..." He added that a trail, 11 miles long, led from this area to the Hudson’s Bay farm at Bellevue.