Italy, eager to emulate the German successes, invaded and annexed the small Balkan Kingdom of Albania. When Germany demanded the annexation of Danzig and an exterritorial connection to East-Prussia, the world braced for war. Poland refused and Britain and France made a Defence Pact with Poland. Germany cancelled the German-Polish non-aggression Pact and the German-British Fleet Treaty.
When Hitler invaded Poland, Britain and France declared war on Germany. Poland was defeated while the Soviets marched into their pre-arranged part of Poland under the pretext of protecting the White-Russian and Ukrainian population of Poland’s Eastern Provinces, while Lithuania was allowed to retake the Vilna area, as a compensation for Memel. Once Poland was conquered the war went into a phase called “the phoney war” A period in which both parties would sit behind their defences while nothing much happened.