On 3 January, General Washington defeated Lord Cornwallis at Princeton. The Continental Congress thereafter adopted the Stars and Stripes.
Citation:
Richert, Lucas Paul. "Cornwallis defeated at Princeton".
The Literary Encyclopedia. First published 01 February 2009
[http://www.litencyc.com/php/stopics.php?rec=true&UID=5919, accessed 18 June 2013.]