1863: Union forces complete their investment of Vicksburg, Mississippi. Want to learn more about the battle of Vicksburg? Go to HistoryNet.com for more. 

Also today in history, in the U.S. and elsewhere:

1643: In his boldest and most brilliant victory, Louis II de Bourbon, duc d'Enghien (later Prince de Condé), destroys a Spanish army in the Battle of Rocroi.

1793: The Netherlands seizes the isle of St. Maarten from the French (which it will hold until 1795).

1919: Mustafa Kemal Pasha lands at Samsun on the Black Sea coast, starting the Turkish War of Independence. 

1941: The new German battleship Bismarck leaves Gdynia, Poland, preparatory to embarking on its first wartime sortie.

1967: U.S. aircraft bomb Hanoi. That'll learn 'em. Check out HistoryNet.com to learn more about the Vietnam War.