Confederate General Robert E. Lee's Army of Northern Virginia fights and loses its last major battle while in retreat from Richmond, Virginia, during the Appomattox Campaign. 1866 – The Grand Army of the Republic, an American patriotic organization composed of Union veterans of the American Civil War, is founded. It lasts until 1956. 1896 – In Athens, the opening of the first modern Olympic Games is celebrated, 1,500 years after the original games are banned by Roman emperor Theodosius I. 1901–present 1909 – Robert Peary and Matthew Henson become the first people to reach the North Pole; Peary's claim has been disputed because of failings in his navigational ability. 1911 – During the Battle of Deçiq, Dedë Gjon Luli Dedvukaj, leader of the Malësori Albanians, raises the Albanian flag in the town of Tuzi, Montenegro, for the first time after George Kastrioti (Skanderbeg). 1917 – World War I: The United States declares war on Germany. 1918 – Finnish Civil War: The battle of Tampere ends. 1926 – Varney Airlines makes its first commercial flight (Varney is the root company of United Airlines). 1929 – Huey P. Long, Governor of Louisiana, is impeached by the Louisiana House of Representatives. 1930 – At the end of the Salt March, Gandhi raises a lump of mud and salt and declares, "With this, I am shaking the foundations of the British Empire." 1936 – Tupelo–Gainesville tornado outbreak: Another tornado from the same storm system as the Tupelo tornado hits Gainesville, Georgia, killing 203. 1941 – World War II: Nazi Germany launches Operation 25 (the invasion of Kingdom of Yugoslavia) and Operation Marita (the invasion of Greece). 1945 – World War II: Sarajevo is liberated from German and Croatian forces by the Yugoslav Partisans. 1945 – World War II: The Battle of Slater's Knoll on Bougainville comes to an end. 1947 – The first Tony Awards are presented for theatrical achievement. 1957 – The flag carrier airline of Greece for decades, Olympic Airways, is founded by Aristotle Onassis following the acquisition of "TAE - Greek National Airlines". 1958 – Capital Airlines Flight 67 crashes into Saginaw Bay near Freeland, Michigan, killing 47. 1965 – Launch of Early Bird, the first commercial communications satellite to be placed in geosynchronous orbit. 1968 – In the downtown district of Richmond, Indiana, a double explosion kills 41 and injures 150. 1968 – Pierre Elliott Trudeau wins the Liberal Party