The Battle of the Scheldt in World War II was a series of military operations led by the First Canadian Army, with Canadian, Polish and British units attached, to open up the shipping route to Antwerp so that its port could be used to supply the Allies in north-west Europe. Under acting command of the First Canadian's Lieutenant-General Guy Simonds, the battle took place in northern Belgium and southwestern Netherlands from October 2 to November 8, 1944. The well-established Wehrmacht defenders staged an effective delaying action, during which the Germans flooded land areas in the Scheldt estuary, slowing the Allied advance. After five weeks of difficult fighting, the Canadian First Army, at a cost of 12,873 Allied casualties (half of them Canadian), was successful in clearing the Scheldt after numerous amphibious assaults, obstacle crossings, and costly assaults over open ground. The Battle of the Scheldt has been described by historians as unnecessarily difficult, as it could have been cleared earlier and more easily had the Allies given it a higher priority than Operation Market Garden.