In Arnhem, Canadian infantrymen had to battle for every house. But in the Canadians’ sweep to the North Sea, resistance virtually ended with the fall of Groningen.

In the industrial hedgehog of the Ruhr, the watery flatlands of The Netherlands and the stream-scalloped woods and plains of northwestern Germany, the fighting last week was a sample of what the Allies may expect in many a pocket. It was several kinds of warfare: hard battling against solid centers…