 On 13 August, Captain Arthur Sinclair led three American vessels (, and ) into Nottawasaga Bay.The Americans believed that "Nancy" was still out on the lake and heading back to the Nottawasaga, and intended to wait in ambush for her in the bay.However, Sinclair landed some of his embarked troops to make an encampment on the spit of land between the river and the lake shore, and some wood-cutting parties discovered the schooner's hiding place.