On 15 August, gunners of the Provincial Marine set up a battery of one 18-pounder and two 12-pounder guns and two mortars on the Canadian shore of the Detroit River (in the grounds of the Francois Bâby House, formerly Hull's headquarters) and began bombarding Fort Detroit, joined by the armed vessel "General Hunter" and the 20-gun sloop-of-war . In the early hours of the morning of 16 August, Tecumseh's warriors crossed the river about south of Detroit. They were followed after daybreak by Brock's force, divided into three small "brigades". The first was composed of 50 men of the Royal Newfoundland Fencibles and some Lincoln and Kent militia; the second consisted of 50 men of the 41st Regiment with York, Lincoln, Oxford and Norfolk militia; the third was formed from the main body of the 41st (200 men) and 50 men of the Royal Artillery with five field guns (three 6-pounders and two 3-pounders). Elements of the Essex militia, which had been disheartened in the face of Hull's initial advance into Upper Canada, also constituted part of Brock's reinvigorated force.