|A Mulberry Harbour was a type of temporary harbour developed in World War II to offload cargo on a beach during the Allied invasion of Normandy.|
By June 9, just 3 days after D-Day, two harbours codenamed Mulberry 'A' and 'B' were constructed at Omaha Beach and Arromanches, respectively. However, a large storm on June 19 destroyed the American harbour at Omaha, leaving only the British harbour which came to be known as Port Winston at Arromanches. While the harbour at Omaha was destroyed sooner than expected, Port Winston saw heavy use for 8 months—despite being designed to last only 3 months. In the 100 days after D-Day, it was used to land over 2.5 million men, 500,000 vehicles, and 4 million tonnes of supplies providing much needed reinforcements in France.
A complete Mulberry harbour was constructed out of 600,000 tons of concrete between 33 jetties, and had 10 miles of floating roadways to land men and vehicles on the beach. Port Winston is commonly upheld as one of the best examples of military engineering. Its remains are still visible today from the beaches at Arromanches.