Today in World War II History—May 9, 1943 POSTED: Wednesday, May 9, 2018 by Sarah Sundin Card made for mothers to send to their sons in uniform, Mother’s Day, 9 May 1943 (Source: US Marine Corps) 75 Years Ago—May 9, 1943: US II Corps breaks through to Tunisian east coast, dividing Axis forces. US celebrates Mother’s Day.