Actually, the flag flying over Ft McHenry during the Battle of Baltimore had 15 stars.
Be durned, I just made one of those assumptions and in compensation for my dumbness, let me share the following:
The 15-star, 15-stripe flag was authorized by the Flag Act of January 13, 1794, adding 2 stripes and 2 Stars. The regulation went into effect on May 1, 1795. This flag was the only U.S. Flag to have more than 13 stripes. It was immortalized by Francis Scott Key during the bombardment of Fort McHenry, Sept 13, 1814.
Thanks for the correction!