When did Francis Scott Key watch the bombing of Fort McHenry?

Francis Scott Key watched the bombing of Fort McHenry during the War of 1812, specifically from September 13 to September 14, 1814. He was aboard a British ship, where he had gone to negotiate the release of a friend who had been captured. The sight of the fort enduring the bombardment inspired him to write the poem that would later become "The Star-Spangled Banner." The poem captures the resilience and bravery displayed during the attack.