The other notable confrontation of the “Phoney War” took place in December 1939 off the coast of Uruguay. The German Pocket Battleship Admiral Graf Spee, a heavy cruiser armed with 15" guns, was chased into Montevideo by three British cruisers. Much to Hitlers dismay, the captain landed his crew, scuttled the ship, and killed himself. The Allies, desperate for victories, made a bigger deal of the Battle of the River Plate than its actual military significance. It did end a surface threat to the merchant lifeline to the United States and the Dominions. The U-boats were taking a fearful toll that was not generally reported.
In the meantime, many opportunities were lost. The French did not fortify their border with Belgium, although a French officer had proved it was vulnerable during war games in 1938. The troops in the Maginot Line did not move they did not conduct maneuvers at all, precluding the possibility that they might be needed somewhere else, like to invade Germany. The French Army had gone to ground, a bad mentality to have in fluid, mobile warfare.
The Phoney War did lull many French and British citizens into a false sense of complacency, thinking the Germans would not prove to have the mettle to invade the vaunted Maginot Line.
Also, the weather in the Winter of 1939 precluded blitzkrieg. In April 1940, the Allies and Germany came to blows over Norway. On May 10, 1940, the Phoney War came to a swift and terrible end with the invasion of France and the low countries. The Germans went around the Maginot Line, counting on its garrison to remain in place. The Phoney War was over; Total War had arrived.