The Battle of the Scheldt was a military operation in the north of Belgium and the southwest of the Netherlands at the end of the Second World War. The Allies wanted to free the Scheldt estuary from the armed forces of Nazi Germany so that Antwerp would become the important Allied supply port for the Allied armies. The city of Antwerp was already liberated for Operation Market Garden, but the area from the Scheldt estuary to the city was not yet. The liberation of the Scheldt estuary was dedicated to the Canadian 1st Army, and would be vital to the planned breakthrough by the Siegfried Line, as Allied supply lines continued to cut back to the landing beaches in Normandy.
There is also a wonderful documentary that provides a lot of information about the Battle of the Scheldt. Here are the links:
http://www.zuidwesttv.nl/video/3515/148/slag-om-de-schelde-1
http://www.zuidwesttv.nl/video/3530/148/slag-om-de-schelde-2
http://www.zuidwesttv.nl/video/3536/148/slag-om-de-schelde-3