Today in World War II History—July 13, 1942 POSTED: Thursday, July 13, 2017 by Sarah Sundin Italian frogman of X MAS, WWII (public domain via Wikipedia) 75 Years Ago—July 13, 1942: Nazis massacre 5000 Jews in Rovno, Ukraine and 1500 in Josefov, Poland. Italian frogmen swim 5 km to Gibraltar and plant limpet mines, sinking three Allied ships. 2 Responses to “Today in World War II History—July 13, 1942” Janice Laird Jul. 13, 2017 Father-in-law was a Navy frogman. Didn’t find this out until very late in his life. Sarah Sundin Jul. 13, 2017 How interesting! It was (and still is) such dangerous work.