Two blockhouses of two stories lay at opposite corners, flanking the stockade walls loopholed for rifles and mountain howitzers.
Within the stockade were wood-framed one-story buildings including the barracks, storehouses, officers quarters, mess hall, kitchen, and bakery.
Brigadier General William S. Harney, Department of Oregon commander, learned that British authorities in Victoria had threatened to arrest Cutlar and dispatched Pickett's company from Fort Bellingham to the island to protect American interests.
While the opposing forces that summer were facing off at San Juan Island, Pickett's men returned and dismantled pieces of Fort Bellingham including one of the blockhouses and reassembled them on the island's southern shore creating "Camp Pickett" later called "Post of San Juan".
What remained of Fort Bellingham was removed by units later occupying the San Juan Island post to improve or repair buildings in their camp.