Historical Events on September 20

22 significant historical events occurred on September 20. September 20 has seen several noteworthy military and political events. On this day, the 1854 Battle of Alma took place during the Crimean War, and the 1863 Battle of Chickamauga occurred during the American Civil War. It is also the date of the 1870 Capture of Rome, which completed Italian unification. In addition, the Formula One Canadian Grand Prix races were held on this date in both 1969 and 1970.