HOW WERE THE MULBERRY HARBORS KEPT A SECRET?
By Ellie Townsley

D-Day invasion June 6,1944

The Allies planned to invade Normandy...but they needed a port

Southampton, England

• American troops brought in, ready for invasion
• Get supplies
• Be sneaky 

Supplies

• 144,000 tons of concrete
• 85,000 tons of ballast