Island Rapids. In September 1814, the Sauk, Fox, and Kickapoo, supported by part of Prairie du Chien's British garrison, repulsed a second American force led by Major Zachary Taylor in the Battle of Credit Island. These victories enabled the Sauk, Fox, and Kickapoo to harass American garrisons further to the south, which led the Americans to abandon Fort Johnson, in central Illinois Territory. Consequently, the Americans lost control of almost all of Illinois Territory, although they held onto the St. Louis area and eastern Missouri. However, the Sauk raided even into these territories, clashing with American forces at the Battle of Cote Sans Dessein in April 1815 at the mouth of the Osage River in the Missouri Territory and the Battle of the Sink Hole in May 1815 near Fort Cap au Gris. This left the British and their Indian allies in control of most of modern Illinois and all of modern Wisconsin. Meanwhile, the British were supplying the Indians in the Old Northwest from Montreal via Mackinac. On 3 July, the Americans sent a force of five vessels from Detroit to recapture Mackinac. A mixed force of regulars and volunteers from the militia landed on the island on 4 August. They did not attempt to achieve surprise, and Indians ambushed them in the brief Battle of Mackinac Island and forced them to re-embark. The Americans discovered the new base at Nottawasaga Bay and on 13 August they destroyed its fortifications and the schooner Nancy that they found there. They then returned to Detroit, leaving two gunboats to blockade Mackinac. On 4 September, the gunboats were taken unawares and captured by British boarding parties from canoes and small boats. These engagements on Lake Huron left Mackinac under British control. The British returned Mackinac and other captured territory to the United States after the war. Some British officers and Canadians objected to handing back Prairie du Chien and especially Mackinac under the terms of the Treaty of Ghent. However, the Americans retained the captured post at Fort Malden near Amherstburg until the British complied with the treaty. Fighting between Americans, the Sauk and other indigenous tribes continued through 1817, well after the war ended in the east. War in the American Northeast Niagara frontier, 1813 Both sides placed great importance on gaining control of the Great Lakes and the St. Lawrence River because of the difficulties of land-based communication. The British