The Bunker Hill Flag, raised at the Battle of Bunker Hill

https://blogfreely.net/branoryccv/the-triangle-fold-meaning-behind-the-13-folds-of-the-flag

The Bunker Hill Flag, raised at the Battle of Bunker Hill, featured a blue field with a white canton and symbolizes the courage and resolve of American soldiers fighting for liberty against British forces in 1775.