Whether dotting the coastline, guarding the banks of the Kennebec or defending the Canadian border, Maine's many forts have sheltered its towns and people since the seventeenth century. Both Fort Kent and Fort Fairfield were built after the War of 1812 during the Aroostook War, when hostilities raged between Mainers and British Canadians over the region's rich timber stands. Portland Harbor's Fort Preble became embroiled in the Civil War when a Confederate raider tried—and failed—to steal a ship from its waters. In the twentieth century, Maine's preservationists protected many of these citadels, including Fort Knox in Penobscot Bay, the largest and most elaborate of all Maine's forts.