"'That the flag of the United States shall be of
thirteen stripes of alternate red and white,
with a union of thirteen stars of white in a blue field,
representing the new constellation.'

This was the resolution adopted by the Continental Congress on June 14, 1777. The resolution was made following the report of a special committee which had been assigned to suggest the flag’s design.

A flag of this design was first carried into battle on September 11, 1777, in the Battle of the Brandywine. The American flag was first saluted by foreign naval vessels on February 14, 1778, when the Ranger, bearing the Stars and Stripes and under the command of Captain Paul Jones, arrived in a French port. The flag first flew over a foreign territory in early 1778 at Nassau, Bahama Islands, where Americans captured a British fort..."

Please visit the following Veterans Administration link to read more about "The Origins of Flag Day": https://www.va.gov/opa/publications/celebrate/flagday.pdf