After the battle, "Niagara" assisted in the transporting of Harrison's army to the mouth of the Detroit River in preparation for an invasion of southwest Ontario. On 25 April 1814, command of "Niagara" was transferred to Arthur Sinclair. After repairs, the fleet—consisting of "Niagara", "Lawrence", "Caledonia", "Scorpion" and "Tigress"—departed Erie for Detroit. In Detroit, soldiers under the command of Colonel George Croghan embarked with the fleet, bound for Mackinac Island. The fleet arrived on 26 July and landed on 4 August. The battle was ultimately lost, with Croghan being forced to retreat back to his boats. On 13 August, the fleet arrived at the mouth of the Nottawasaga River where they attacked a blockhouse owned by the North West Company. The blockhouse was destroyed by the British, along with the schooner HMS "Nancy", to prevent their supplies from being captured.