<p>Osprey''s study of the Walcheren campaign of World War II (1939-1945). Walcheren is a saucer-shaped island in the estuary of the river Scheldt, commanding maritime access to Antwerp, the largest port in Western Europe. The Allies captured Antwerp intact on September 4, 1944, but their eyes were on the Rhine crossings at Arnhem, not the lower Scheldt. The failure of Operation Market-Garden later that month brought home the Allies'' logistical weakness. As autumn gales drew near, every shell and petrol tin had still to be landed at Cherbourg or across the Normandy beaches. Complete US Army divisions were immobilized for lack of transport. It was vital to re-open Antwerp. The continued German presence on Walcheren, however, prevented Allied shipping from entering the Scheldt.<br><br>In the fall of 1944, Walcheren had the most heavily fortified coastline in the world. Its seaward defences consisted of 30 coastal and field batteries, mounting 50-60 guns from 75mm to 220mm in caliber, man