Image Source: U.S. Navy
The attack on Pearl Harbor on December 7, 1941, devastated the U.S. Pacific Fleet and reshaped Nimitz’s career overnight. On December 17, President Roosevelt selected him to take command of the fleet, and on December 31, 1941, Nimitz was sworn in as Commander in Chief, Pacific Fleet aboard the submarine USS Grayling — a deliberately symbolic setting, since much of the surface fleet lay damaged in the harbor around him.
Nimitz inherited a fleet in crisis and a theater of war spanning millions of square miles. He steadied the command in its darkest early months, backed the calculated risk-taking that produced victory at the Battle of Coral Sea and the Battle of Midway in 1942, and built the organizational, logistical, and intelligence framework — including close collaboration with Navy codebreakers — that allowed the United States to go on the offensive. Over the following three years, he directed the broader Pacific campaign in close coordination with General Douglas MacArthur’s Southwest Pacific command, balancing the demands of two parallel lines of advance toward Japan.