When and where was the Star Spangled Banner first flown?

Question

The Red Ensign, a flag that originated in the early 17th century as a British ensign flown by the Royal Navy, is currently specifically used by which group?

Answer 1

1814
The flag was flown over Fort McHenry, the coastal bastion fort for the port city of Baltimore, during the Battle of Baltimore in 1814, part of the USA's 1812 to 1815 war against Britain.