How did the rockets red glare and bombs bursting in air?

The phrase "the rockets' red glare, the bombs bursting in air" refers to the imagery of the War of 1812, particularly during the Battle of Fort McHenry, which inspired Francis Scott Key to write "The Star-Spangled Banner." It describes the sight of artillery fire and rockets illuminating the night sky, symbolizing the struggle for American independence and resilience. This vivid imagery captures the tension and hope of the defenders as they witnessed the flag still flying despite the bombardment.