4th » The National Association of Professional Base Ball Players called National Association, the first professional baseball league, opens its first season in Fort Wayne, Indiana.
21st » French troops invade the Paris Commune and engage its residents in street fighting. By the close of "Bloody Week", some 20,000 communards have been killed and 38,000 arrested.
21st » Opening of the first rack railway in Europe, the Rigi-Bahnen on Mount Rigi.
22nd » The United States Army known as U.S. Army issues an order for abandonment of Fort Kearny in Nebraska.