The Battle of Normandy alone, which began on D-Day (June 6, 1944), resulted in 253,700 casualties (53,700 Allies; 200,000 Nazis).
The average man has approximately 10 pints of blood flowing through his veins.
About 317,125 gallons of blood were shed in the Normandy campaign.
A standard Olympic swimming pool holds approximately 253,125 gallons of water.
The blood shed in the Normandy conflict would fill up a standard Olympic size swimming pool one and a quarter times.
Source: personal research