The German invasion of Norway and Denmark in April 1940, which is usually regarded as marking the end of the so-called Phoney War between Germany and the Allies, also led to a short-lived diplomatic stand-off between the United States and Canada. The tension stemmed primarily from misapprehensions in both North American countries over what should be done about Greenland, the Danish colony whose political and legal status had suddenly been placed in question by the German move. It soon subsided, but in the process it resulted in a pronounced overreaction by some on the US side of the dispute. The quarrel largely took place behind the scenes and has attracted relatively little attention from historians. In fact, although the US government mostly got its way at the expense of Canada, the Greenland episode was presented by Prime Minister Mackenzie King as an instance of diplomatic cooperation to the benefit of both countries – a view that has been repeated by later commentators. If the episode really did represent an instance of close cooperation between Canada and the United States, then it was only in a Pickwickian sense, that is, one in which the reality of the situation was very different from the roseate view offered by its apologists.