Kazimierz Pułaski, English Casimir Pulaski (born March 6, 1745, Warsaw, Poland—died October 11/15, 1779, aboard ship between Savannah, Georgia, and Charleston, South Carolina, U.S.), Polish patriot and U.S. colonial army officer, hero of the Polish anti-Russian insurrection of 1768 (the Confederation of Bar) and of the American Revolution.