Operation Market Garden was to take a bridge over a canal at Arnhem in the Netherlands. It Iinvolved the largest military parachute drop in history, on to the farmland surrounding the inland town. It’s not near the sea. At all.
The campaign you may be looking for is, I feel strongly, Operation Dynamo, which was launched to evacuate the BEF from the beeches near Dunkirk in Northern France. The poor souls encamped on the beeches, being strafed by the Luftwaffe, were indeed ordered to enter the water to meet the “little ships”, the flotilla of small craft requisitioned by the Royal Navy fro