From the beginning of the siege Pontiac had hoped that the French traders and settlers would join him to force the surrender of the fort. The arrival of the reinforcement under Cuyler made him despair of winning without their assistance, and early in July he sent his Indians to the leading inhabitants along the river, ordering them to a council, at which he hoped by persuasion or threats to make them take up arms. This council was attended by such settlers as Robert Navarre, Zacharie Sicotte, Louis Campau, Antoine Cuillerier, Francois Meloche, all men of standing and influence. In his address to them Pontiac declared: 'If you are French, accept this war-belt for yourselves, or your young men, and join us; if you are English, we declare war upon you.'
The Gladwyn had brought news of the Peace of Paris between France and England. Many of the settlers had been hoping that success would crown the French arms in Europe and that Canada would be restored. Some of those at the council said that these articles of peace were a mere ruse on the part of Gladwyn to gain time. Robert Navarre, who had published the articles of peace to the French and Indians, and several others were friendly to the British, but the majority of those present were unfriendly. Sicotte told Pontiac that, while the heads of families could not take up arms, there were three hundred young men about Detroit who would willingly join him. These words were probably intended to humour the chief; but there were those who took the belt and commenced recruiting among their fellows. The settlers who joined Pontiac were nearly all half-breeds or men mated with Indian wives. Others, such as Pierre Reaume and Louis Campau, believing their lives to be in danger on account of their loyalty to the new rulers, sought shelter in the fort.
By July 4 the Indians, under the direction of French allies, had strongly entrenched themselves and had begun a vigorous attack. But a force of about sixty men marched out from the fort and drove them from the position. In the retreat two Indians were killed, and one of the pursuing soldiers, who had been a prisoner among the Indians and had learned the ways of savage warfare, scalped one of the fallen braves. The victim proved to be a nephew of the chief of the Saginaw Chippewas, who now claimed life for life, and demanded that Captain Campbell should be given up to him. According to the 'Pontiac Manuscript' Pontiac acquiesced, and the Saginaw chief killed Campbell 'with a blow of his tomahawk, and after cast him into the river.' Campbell's fellow-prisoner McDougall, along with two others, had escaped to the fort some days before.
The investment continued, although the attacks became less frequent. The schooners manoeuvring in the river poured broadsides into the Indian villages, battering down the flimsy wigwams. Pontiac moved his camp from the mouth of Parent's Creek to a position nearer Lake St Clair, out of range of their guns, and turned his thoughts to contrive some means of destroying the troublesome vessels. He had learned from the French of the attempt with fire-ships against the British fleet at Quebec, and made trial of a similar artifice. Bateaux were joined together, loaded with inflammable material, ignited, and sent on their mission but these 'fire-ships' floated harmlessly past the schooners and burnt themselves out. Then for a week the Indians worked on the construction of a gigantic fire-raft, but nothing came of this ambitious scheme.
It soon appeared that Pontiac was beginning to lose his hold on the Indians. About the middle of July ambassadors from the Wyandots and Potawatomis came to the fort with an offer of peace, protesting, after the Indian manner, love and friendship for the British. After much parleying they surrendered their prisoners and plunder; but, soon after, a temptation irresistible to their treacherous natures offered itself, and they were again on the war-path.
Amherst at New York had at last been aroused to the danger; and Captain James Dalyell had set out from Fort Schlosser with twenty-two barges, carrying nearly three hundred men, with cannon and supplies, for the relief of Detroit. The expedition skirted the southern shore of Lake Erie until it reached Sandusky. The Wyandot villages here were found deserted. After destroying them Dalyell shaped his course for the Detroit river. Fortune favoured the expedition. Pontiac was either ignorant of its approach or unable to mature a plan to check its advance. Through the darkness and fog of the night of July 28 the barges cautiously crept up-stream, and when the morning sun of the 29th lifted the mists from the river they were in full view of the fort. Relief at last! The weary watching of months was soon to end. The band of the fort was assembled, and the martial airs of England floated on the morning breeze. Now it was that the Wyandots and Potawatomis, although so lately swearing friendship to the British, thought the opportunity too good to be lost. In passing their villages the barges were assailed by a musketry fire, which killed two and wounded thirteen of Dalyell's men. But the soldiers, with muskets and swivels, replied to the attack, and put the Indians to flight. Then the barges drew up before the fort to the welcome of the anxious watchers of Detroit.
The reinforcement was composed of men of the 55th and 8th regiments, and of twenty Rangers under Major Robert Rogers. Like their commander, Dalyell, many of them were experienced in Indian fighting and were eager to be at Pontiac and his warriors. Dalyell thought that Pontiac might be taken by surprise, and urged on Gladwyn the advisability of an immediate advance. To this Gladwyn was averse; but Dalyell was insistent, and won his point. By the following night all was in readiness. At two o'clock in the morning of the 31st the river gate was thrown open and about two hundred and fifty men filed out.
Heavy clouds hid both moon and stars, and the air was oppressively hot. The soldiers marched along the dusty road, guided by Baby and St Martin, who had volunteered for the work. Not a sound save their own dull tramp broke the silence. On their right gleamed the calm river, and keeping pace with them were two large bateaux armed with swivels. Presently, as the troops passed the farm-houses, drowsy watch-dogs caught the sound of marching feet and barked furiously. Pontiac's camp, however, was still far away; this barking would not alarm the Indians. But the soldiers did not know that they had been betrayed by a spy of Pontiac's within the fort, nor did they suspect that snake-like eyes were even then watching their advance.
At length Parent's Creek was reached, where a narrow wooden bridge spanned the stream a few yards from its mouth. The advance-guard were half-way over the bridge, and the main body crowding after them, when, from a black ridge in front, the crackle of musketry arose, and half the advance-guard fell. The narrow stream ran red with their blood, and ever after this night it was known as Bloody Run. On the high ground to the north of the creek a barricade of cordwood had been erected, and behind this and behind barns and houses and fences, and in the corn-fields and orchards, Indians were firing and yelling like demons. The troops recoiled, but Dalyell rallied them; again they crowded to the bridge. There was another volley and another pause. With reckless bravery the soldiers pressed across the narrow way and rushed to the spot where the musket-flashes were seen. They won the height, but not an Indian was there. The musket-flashes continued and war-whoops sounded from new shelters. The bateaux drew up alongside the bridge, and the dead and wounded were taken on board to be carried to the fort. It was useless to attempt to drive the shifty savages from their lairs, and so the retreat was sounded. Captain Grant, in charge of the rear company, led his men back across the bridge while Dalyell covered the retreat; and now the fight took on a new aspect. As the soldiers retreated along the road leading to the fort, a destructive fire poured upon them from houses and barns, from behind fences, and from a newly dug cellar. With the river on their left, and with the enemy before and behind as well as on their sight, they were in danger of being annihilated. Grant ordered his men to fix bayonets: a dash was made where the savages were thickest, and they were scattered. As the fire was renewed panic seized the troops. But Dalyell came up from the rear, and with shouts and threats and flat of sword restored order. Day was breaking; but a thick fog hung over the scene, under cover of which the Indians continued the attack. The house of Jacques Campau, a trader, sheltered a number of Indians who were doing most destructive work. Rogers and a party of his Rangers attacked the house, and, pounding in the doors, drove out their assailants. From Campau's house Rogers covered the retreat of Grant's company, but was himself in turn besieged. By this time the armed bateaux, which had borne the dead and wounded to the fort, had returned, and, opening fire with their swivels on the Indians attacking Rogers, drove them off; the Rangers joined Grant's company, and all retreated for the fort. The shattered remnant of Dalyell's confident forces arrived at Fort Detroit at eight in the morning, after six hours of marching and desperate battle, exhausted and crestfallen. Dalyell had been slain—an irreparable loss. The casualty list was twenty killed and forty-two wounded. The Indians had suffered but slightly. However, they gained but little permanent advantage from the victory, as the fort had still about three hundred effective men, with ample provisions and ammunition, and could defy assault and withstand a protracted siege.
In this fight Chippewas and Ottawas took the leading part. The Wyandots had, however, at the sound of firing crossed the river, and the Potawatomis also had joined in the combat, in spite of the truce so recently made with Gladwyn. At the battle of Bloody Run at least eight hundred warriors were engaged in the endeavour to cut off Dalyell's men. There was rejoicing in the Indian villages, and more British scalps adorned the warriors' wigwams. Runners were sent out to the surrounding nations with news of the victory, and many recruits were added to Pontiac's forces.