Gerd von Rundstedt
Under the command of Field Marshals Erwin Rommel and Gerd von Rundstedt, the defences of the Atlantic Wall were heavily upgraded; in the first six months of 1944, 1.2 million tons of steel and 17.3 million cubic yards of concrete were laid. The coast of northern France was also studded with four million antitank and anti-personnel mines, and 500,000 beach obstacles.