OTL the German army did very little between the fall of Czechoslovakia and the invasion of Poland and between Poland and Denmark-Norway and before France, then between France and the Balkans. Moreover, Hitler wasted a large number of invaluable planes over Britain for no return on investment and he allowed Italy and Japan to dictate whom and where Germany had to fight, a rather absurd situation. Hitler also signed a pact with the USSR, whose secrte protocol empowered him to invade Lithuania, but he didn't invade it and when Stalin asked in late September 1939 to trade Lithuania for other parts of Poland he agreed. Hitler signed this secret protocol splittling Poland, but without specifying that the Soviet Union had to attack simultaneously, which allowed Stalin to wait until Poland was practically defeated to take his part of Poland with minimal losses and munitions use, while Germany lost the equivalent of 3 divisions, lots of vehicles, Panzers, etc, and spent millions in munitions, This resulted in Germany having to invade Luxemburg, Holland, Belgium and France on May 10, 1940. Then Germany having to fight with a weak force in N Africa and with a strong force simultaneously in Greece and Yugoslavia, then it had to invade Lithuania, Latvia, Estonia and the USSR on June 22, 1941. Assuming that Hitler is smarter, here is an alternate policy, strategy and sequence of events. April 1, 1939 Germany invades Lithuania (11 divisions, 5 of which rapidly advance to western Latvia), western Latvia, Luxemburg (a division), Denmark (a division) and Holland (10 divisions), all of which have extremely weak military and invaluable strategic location. The allies and Soviets are shocked, but with Germany already in these countries and with Britain having a very small army and 278 modern fighters and with the USSR having lost many of its officers during the purges, the USSR, Poland, France and Britain cannot afford to declare war yet, so they only accelerate armament production and army expansion and prepare defenses. During these invasions, on April 3 Hitler and a few leaders of the WM, LW, etc, travel to Moscow for a summit with Stalin (like the one Chamberlain had with Hitler before Munich) and in order to negotiate personally a mutual, 5 year, non aggression and assistance pact, whose secret protocol specifies that eastern Latvia, Estonia, eastern Finland, eastern Poland, Bessarabia, Iran, etc, are in the Soviet sphere of influence, while Sweden, Norway, western Europe, etc, are in the German sphere of influence. Moreover, German and Soviet military leaders are to determine and specify in the protocol the date of the invasion of Poland and each country agrees to commit at least 50 divisions, 2,000 tanks, 3,000 planes (at least half of them bombers), 6,000 cannon, etc, so that Poland wil have to split its forces and fight on 2 long and strong fronts. 5 Soviet divisions with their supplies will be allowed transit through German Lithuania before the invasion to attack Poland also from that direction on the day of the invasion. The Soviet army's highest priority is to capture the Romanian-Polish border within 2 weeks in order to prevent reinforcements, materiel and supplies from reaching Poland and Polish troops from escaping through Romania. The pact is signed on April 6, 1939. The date for the invasion of Poland is set for June 15. During the summit Hitler informs Stalin that he pans to invade Norway and Sweden and given the weak RAF and Britain's reluctance to go to war, Hitler urges Stalin to invade Iran soon, before invading Poland, in order to deprive Britain from its oil and disuade it from declaring war when Poland is invaded. Italy invades Albania on April 7-12, 1939. On April 15, Hitler proposes to Mussolini to invade western Croatia, while Germany invades eastern Croatia and Slovenia. They do so on April 28. Croatian and Slovenian troops surrender rapidly, some even join the invaders against the remaining Serb troops in Croatia. Yugoslavia is weak and isolated(it faces the axis also in Albania), so it cannot afford to declare war on the invaders. On May 1, 1939 Germany invades Sweden and Norway simultaneously. It captures key airports in both countries and moves large numbers of troops and planes to the area. Stalin is surprised by the inaction of the allies and decides to invade Iran on May 10, 1939, which promptly falls, boosting Stalin's confidence and greed. Turkey is alarmed with Soviet forces also in Iran and prepares to resist an invasion. In late May, 1939 Germany and the USSR begin to mass troops along their Polish borders. On June 1 Hitler leaks a copy of the secret protocol of the pact to Poland, Finland and Romania and offers Poland the chance to join Germany, Finland, Turkey and Romania to fight the USSR. Germany will sell Poland, etc, planes and armament and let Poland keep Belorussia and 1/4 of the Ukraine (including Kiev) if the USSR is defeated. Similarly, it offers Romania the chance to save Bessarabia and if it joins Germany and Poland against the USSR, Romania will receive 1/4 of the Ukraine (including Odessa). Turkey is also offered air and army support to fight the USSR in Iran and to capture Baku in order to deprive the USSR of Iranian and Baku oil. If the USSR is defeated, Turkey can keep the southern Caucasus..Finally, Hitler offers Finland the possibility of saving its eastern territory and acquiring the Kola Peninsula, Estonia, Soviet Karelia and Leningrad if the USSR is defeated by the coalition. Poland knows that it cannot fight both giants simultaneously, so its top leaders debate for 3 days whether to fight a suicidal war (without hope of supplies through Romania), surrender to both countries, allow peaceful occupation and disappear as a nation or join the strong, secret coalition against the USSR and expand its borders. On June 4 Poland secretly agrees to join Germany. Once Poland is in the game, Romania, Turkey and Finland join within days. Throughout the night of June 14 Poland alloes German trooops to advance west by train and German planes to fley west. German troops also advance to the Romanian and Finnish borders with the USSR. Early on June 15, 1939 the USSR is preparing to attack. However, just before the attack, the Soviet divisions in Lithuania are disarmed and weapons and prisoners are handed over to the Poles. The Poles have concentrated their forces on their eastern border and receive German air support from Lithuania, so that the invading Soviets take heavy casualties and Polish forces advance into the USSR. German forces in Lithuania and west Latvia rapidly advance into east Latvia and Estonia. Romanian, Turkish and Finnish forces attack, surprising completely the Soviet forces along their borders and advance rapidly. German forces advance from Norway and Finand and provide air support for the Finnish army.