Today in World War II History—Mar. 25, 1943 POSTED: Sunday, March 25, 2018 by Sarah Sundin US poster, WWII 75 Years Ago—Mar. 25, 1943: Neutral Spain closes its border with Nazi-occupied France. Battle for convoy HX-231 begins (through April 8), the first time an Allied Atlantic convoy beats off German U-boats without loss.