Italy had been unprepared for war when Hitler attacked Poland, but if the Italian leader, Benito Mussolini, was to reap any positive advantages from partnership with Hitler it seemed that Italy would have to abandon its nonbelligerent stance before the western democracies had been defeated by Germany singlehanded. The obvious collapse of France convinced Mussolini that the time to implement his Pact of Steel with Hitler had come, and on June 10, 1940, Italy declared war against France and Great Britain. With about 30 divisions available on their Alpine frontier, the Italians delayed their actual attack on southeastern France until June 20, but it achieved little against the local defense. In any case, the issue in France had already been virtually settled by the victory of Italy’s German ally.

Meanwhile, Reynaud had left Paris for Cangé, near Tours; and Weygand, after speaking frankly and despondently to Churchill at the Allied military headquarters at Briare on June 11, told Reynaud and the other ministers at Cangé on June 12 that the battle for France was lost and that a cessation of hostilities was compulsory. There was little doubt that he was correct in this estimate of the military situation: the French armies were now splitting up into fragments. Reynaud’s government was divided between the advocates of capitulation and those who, with Reynaud, wanted to continue the war from French North Africa. The only decision that it could make was to move itself from Tours to Bordeaux.

The Germans entered Paris on June 14, 1940, and were driving still deeper southward along both the western and eastern edges of France. Two days later they were in the Rhône valley. Meanwhile, Weygand was still pressing for an armistice, backed by all the principal commanders. Reynaud resigned office on June 16, whereupon a new government was formed by Marshal Philippe Pétain, the revered and aged hero of the Battle of Verdun in World War I. In the night of June 16 the French request for an armistice was transmitted to Hitler. While discussion of the terms went on, the German advance went on too. Finally, on June 22, 1940, at Rethondes, the scene of the signing of the Armistice of 1918, the new Franco-German Armistice was signed. The Franco-Italian Armistice was signed on June 24. Both armistices came into effect early on June 25.

The Armistice of June 22 divided France into two zones: one to be under German military occupation and one to be left to the French in full sovereignty. The occupied zone comprised all northern France from the northwestern frontier of Switzerland to the Channel and from the Belgian and German frontiers to the Atlantic, together with a strip extending from the lower Loire southward along the Atlantic coast to the western end of the Pyrenees; the unoccupied zone comprised only two-fifths of France’s territory, the southeast. The French Navy and Air Force were to be neutralized, but it was not required that they be handed over to the Germans. The Italians granted very generous terms to the French: the only French territory that they claimed to occupy was the small frontier tract that their forces had succeeded in overrunning since June 20. Meanwhile, from June 18, General Charles de Gaulle, whom Reynaud had sent on a military mission to London on June 5, was broadcasting appeals for the continuance of France’s war.

The collapse of France in June 1940 posed a severe naval problem to the British, because the powerful French Navy still existed: strategically, it was of immense importance to the British that these French ships not fall into German hands, since they would have tilted the balance of sea power decidedly in favour of the Axis—the Italian Navy being now also at war with Britain. Mistrustful of promises that the French ships would be used only for “supervision and minesweeping,” the British decided to immobilize them. Thus, on July 3, 1940, the British seized all French ships in British-controlled ports, encountering only nominal resistance. But when British ships appeared off Mers el-Kébir, near Oran on the Algerian coast, and demanded that the ships of the important French naval force there either join the Allies or sail out to sea, the French refused to submit, and the British eventually opened fire, damaging the battleship Dunkerque, destroying the Bretagne, and disabling several other vessels. Thereupon, Pétain’s government, which on July 1 had installed itself at Vichy, on July 4 severed diplomatic relations with the British. In the eight following days, the constitution of France’s Third Republic was abolished and a new French state created, under the supreme authority of Pétain himself. The few French colonies that rallied to General de Gaulle’s Free French movement were strategically unimportant.