Fort Pitt Museum Pitt, after William Pitt the Elder. As a result, in 1763 local Delawares and Shawnees took part in Pontiac's Rebellion, an effort to drive the British out of their territory. The Indians' siege of Fort Pitt began on June 22, 1763, but the fort was too strong to be taken by force. In negotiations during the siege, the commander of Fort Pitt gave two Delaware emissaries blankets that had been exposed to smallpox, in hopes of infecting the surrounding Indians and ending the siege. The effectiveness of this attempt is unclear. Outbreaks of smallpox had plagued Native Americans for years
Siege of Donegal Crown forces were able to use Donegal as a base to capture the strategic town of Ballyshannon. Conn O'Donnell was killed during the siege, while fighting for the Crown. Siege of Donegal The Siege of Donegal took place in 1601 during Tyrone's Rebellion when a force led by Hugh Roe O'Donnell laid siege to the settlement of Donegal. The garrison of the town were a mixture of Irish Army troops and Gaelic forces loyal to the Crown led by Niall Garve O'Donnell. Heavy fighting took place during the month-long siege in which Donegal Abbey was wrecked by an accidental gunpowder