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At dawn Hitler launched a full planned attack on Poland. This attack was a complete surprise to the polish as german forces entered their Northern, Southern and Western borders. The polish army was stationed too close to the border which coincidentally helped the German charge. The Battle of Westerplatte, the Battle of Danzig Bay as well as the Battle of Mława were all on this day. Another name for the engagement was the Battle of the Border which also took place during the following days.

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On the third the second world war starts because Britain and France declare war on Germany. This is less than 20 years after world war one. However France and Britain's announcement did little to help the people of Poland.

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Battle of Piotrków Trybunalski was an attack by the germans on Piotrków. It was a quick win for the germans due to their new military strategy the Blitzkrieg. Many polish lives where lost in the battle because of the Germans highly advanced panzer division.

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Battle of Łódź was another victory for the germans. Due to Łódź's fall, the Polish armoured brigade had to withdraw from Piotrkow Trybunalski. This just shows how one win can affect different battles. It also allowed germany to be closer to the capital and capture of Poland.

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The Battle of Hel was fought on the Hel peninsula between the german and polish forces.

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Battle of the Bzura River also called the Battle of Kutno was one of the largest polish offensives against the invasion. At first the attempt seemed successful but as the battle continued they were outnumbered. Eventually the troops, Armia 'Poznań' and Armia 'Pomorze', were shattered by the Germans.

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Battle of Lwów was a land and air battle. It was an attempt from the polish to stop the germans from taking the city of Lwów. The Polish originally assumed that the city was too far back to need defenses but the german Blitzkrieg showed them otherwise. On September 22 the polish surrendered. They were ordered to join the soviet forces. However the USSR broke the terms and started killing polish officers this became known as the Katyn Massacre.

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The Battle of Modlin was between Germany and Poland.

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Due to the Nazi-Soviet Pact the Polish found themselves fighting on two fronts when the soviets invaded from the east. This pressured and trapped the already struggling Polish army. It is said that the occupation of Poland was in the fine print of the pact. The details of the non-aggression pact was not revealed until 1990.

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The Battle of Krasnobród was fought between the german and polish armies. It was one of the last european battles were cavalry was used on both sides.

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The Battle of Władypol was fought between the polish and soviet army.

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On September 27 the germans entered Warsaw and the next day the polish surrendered. It was signed by the polish and german armies (I found no specific generals or leaders that signed it). It was the battle that led to the german capture of Poland.

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Battle of Wytyczno was a battle between soviet and polish troops. Poland only had 3,000 men and was running low on supplies. The soviets had tank units and the polish mere horses. The battle was won by the soviets.

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October 5 is the official end date of the invasion. This means that Poland was now under Nazi control. The charge against Poland was an example of the effectiveness of the Blitzkrieg especially considering the time it took to capture the country.

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Pictures
https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~277734~90050753:Germany--Map-of-the-Occupation-Area
https://www.sandiegouniontribune.com/news/150-years/sd-me-150-years-september-3-htmlstory.html
http://www.deathcamps.org/occupation/piotrkow%20ghetto.html
https://en.wikipedia.org/wiki/Battle_of_%C5%81%C3%B3d%C5%BA_%281939%29
https://en.wikipedia.org/wiki/Siege_of_Warsaw_%281939%29
https://en.wikipedia.org/wiki/Battle_of_Hel
https://tvpworld.com/44319260/largest-battle-of-german-invasion-of-poland-1939-began-80-years-ago
https://en.wikipedia.org/wiki/Battle_of_Lw%C3%B3w_%281939%29

Websites
https://www.history.com/news/world-war-ii-begins-german-invasion-poland-1939
https://www.history.com/news/world-war-ii-begins-german-invasion-poland-1939
https://www.ushmm.org/learn/timeline-of-events/1939-1941/german-invasion-of-poland#:~:text=September%201%2C%201939,-Germany%20invades%20Poland&text=But%2C%20after%20heavy%20shelling%20and,under%20German%20occupation%20until%201945.
https://www.britannica.com/event/Invasion-of-Poland
https://encyclopedia.ushmm.org/content/en/article/invasion-of-poland-fall-1939
https://www.history.com/this-day-in-history/soviet-union-invades-poland
https://codenames.info/operation/battle-of-wytyczno/
https://codenames.info/operation/battle-of-lwow/