First Monday in March
Today the state of Illinois (which wasn’t around in 1778, but does have a large Polish population), celebrates Casimir Pulaski Day. The 32 year-old man died aboard a ship at sea from a thigh wound he received from a stray cannonball, way back during the Revolutionary War.
The last federal fort to be built in America, Fort Pulaski, which was named in his honor, is located in Savannah, Georgia. Designed to defend our soil against those pesky Spanish armadas, the citadel never saw action until the Civil War, and then, only briefly. Under siege by a newly-invented rifle cannon located three miles away, the fort wisely surrendered.