The First Siege: On May 1, 1813, British allied forces, under General Henry Proctor and Chief Tecumseh, opened a bombardment of the fort, which had mustered 1,200 regulars and militia, and laid siege. Reinforcements reached the fort on May 4, increasing its garrison to 2,800. Early on the morning of May 5, a detachment from Clay's brigade under Colonel William Dudley landed from boats on the north bank of the river, stormed the British batteries on the north bank and spiked the guns. Coming under fire from Indians in the woods, part of the Kentuckian force pursued Tecumseh's men, who led them deeper into the forest. In the woods, the disorganized Kentuckians suffered heavy casualties in confused fighting. Nearly 550 were captured, and of Dudley's 866 officers and men, only 150 returned to the fort. This became known as "Dudley's Massacre" or "Dudley's Defeat".