Allied forces take Pisa a key position in the last German Army defensive line in Italy. In France U.S. forces take St. Lo and British move on Caen, a critical road hub in the Normandy region. In the Pacific, U.S. forces land on Guam and Tinian in the Marianas. Japanese war leader Tojo resigns. A plot by German politicians and military leaders to assassinate Hitler on July 20, 1944 fails.