According To President Roosevelt, Why Was Japan’s Attack On Pearl Harbor Such A Surprise?. The attack on pearl harbor was a surprise military strike by the empire of japan on the united states pacific fleet at its naval base at pearl harbor on oahu, hawaii, on december 7, 1941. Roosevelt famously described as a date which will live in.

The attack on pearl harbor was a surprise military strike by the empire of japan on the united states pacific fleet at its naval base at pearl harbor on oahu, hawaii, on december 7, 1941. Entering the war on the side of the allies on the day following the att… Was a neutral country in world war ii.