According to (history.com)it states that,In "April, Pontiac convened a war council on the banks of the Ecorse River near Detroit. It was decided that Pontiac and his warriors would gain access to the British fort at Detroit under the pretense of negotiating a peace treaty, giving them an opportunity to seize forcibly the arsenal there. However, British Major Henry Gladwin learned of the plot, and the British were ready when Pontiac arrived in early May, and Pontiac was forced to begin a siege".Also it says that"On July 31, a British relief expedition attacked Pontiac’s camp but suffered heavy losses and were repelled in the Battle of Bloody Run. Nevertheless, they had succeeded in providing the fort at Detroit with reinforcements and supplies, which allowed it to hold out against the Indians into the fall. The major forts at Pitt and Niagara likewise held on, but the united tribes captured eight other fortified posts. At these forts, the garrisons were wiped out, relief expeditions were repulsed, and nearby frontier settlements were destroyed".
