The Battle of Sekigahara on September 15, 1600, marked the rise of the Tokugawa shogunate in Japan. On September 15, 1928, Scottish bacteriologist Alexander Fleming discovered penicillin while studying influenza. — On September 15h, 1950, United Nations troops landed at Inch’ŏn, South Korea, crippling a North Korean invasion during the Korean War. — On this day in 1944, the U.S. 1st Marine Division landed on the island of Peleliu, one of the Palau Islands in the Pacific, as part of a larger operation to provide support for Gen. Douglas MacArthur, who was preparing to invade the Philippines. Within one week …