Following Britain's victory in the French and Indian War, Native American nations found British policy far harsher than French rule had been, prompting Pontiac to organize a coalition of tribes. His forces surrounded Fort Detroit for months, unable to capture it but igniting a wider conflict across the frontier that forced London to reconsider colonial expansion policy.
Pontiac, an Ottawa war leader, had grown alarmed by British commander Jeffrey Amherst's decision to end the French practice of giving gifts and gunpowder to Native allies, along with a wave of settlers pushing into tribal lands. He rallied Ottawa, Ojibwe, Potawatomi, and other nations around a spiritual message from the Delaware prophet Neolin, who urged Native peoples to reject European goods and reclaim their independence.
On May 12, 1763, Pontiac's warriors surrounded Fort Detroit, beginning a siege that would stretch on for months without ever breaching its walls. The uprising spread rapidly, and tribes struck British forts and settlements across the Ohio Valley and Great Lakes, forcing garrisons to abandon several posts entirely.
Though the siege of Detroit ultimately failed, the broader war it triggered convinced the British Crown to issue the Royal Proclamation of 1763, barring colonial settlement west of the Appalachians. That decision infuriated American colonists and became one of the grievances feeding into resentment that eventually erupted in the American Revolution.