The number of warriors under the command of Pontiac is variously estimated from six hundred to two thousand. The garrison consisted of one hundred twenty soldiers, eight officers, and about forty others capable of bearing arms. Two armed schooners, The Beaver and The Gladwyn, were anchored in the river near the Fort. Pontiac's plot was revealed to Gladwyn the night before its proposed execution by an Ojibwa girl from the Pottawottomi village.[50] Gladwyn, thus warned, was forearmed. Pontiac and his six chiefs were admitted to the council-chamber. Pontiac began the harangue of peace and friendly palaver and was about to give the preconcerted signal when Gladwyn raised his hand and the sound of clashing arms and drum-beating was heard without. Pontiac feared he was foiled, and announcing that he would "call again," next time with his squaws and children, he and his party withdrew. The next morning, Pontiac, in hopes of regaining Gladwyn's confidence, repaired to the Fort with but three of his chiefs, and bearing in his hand the pipe of peace. Offering it to Gladwyn he again protested his friendship for the British, whom he declared "we love as our brothers." A few days later, the Indians thronged the open field behind the Fort gate. It was closed and barred. Pontiac, advancing, demanded admittance. Gladwyn replied that he might enter, but only alone. The great chief, baffled and enraged, then "threw off the mask he had so long worn" and boldly declared his intention to make war. A day or two later the four tribes, Ottawas, Ojibwas, Pottawottomis, and Wyandots, clamored about the Fort, and the attack was begun by volleys of bullets fired at the palisade walls. Thus opened the famous siege of Detroit, which lasted six months, from May 1 to November 1 (1763), one of the longest and most bitterly contested sieges in the history of Western Indian warfare. The incomparable treachery of Pontiac in endeavoring to secure the Fort by dissemblance of friendship was further evidenced by his pretence at a truce. Pontiac declaring his earnest desire for "firm and lasting peace," requested Gladwyn to send to the camp of the chief, Captain Campbell, Gladwyn's second in command, a veteran officer and most upright and manly in character. Campbell went, was made prisoner, and subsequently was foully and hideously murdered. Pontiac neglected no expedient known to Indian perfidy, cruelty, or deviltry. He surpassed his race in all the detestable elements of their nature. His conduct from first to last was only calculated to create distrust, contempt, and loathing. His warriors murdered the British settlers in the vicinity of the Fort, burned their huts, robbed the Canadians, and committed every variety of depredation.