At 08:00 hours, September 1st, German troops, still without a formal declaration of war issued, attacked near the Polish town of Mokra beginning series of battles collectively called the Battle of the Border. Later that day, the Germans opened fronts along Poland's western, southern and northern borders, while German aircraft began raids on Polish cities.
The main routes of attack led eastwards from Germany proper through the western Polish border. A second route carried supporting attacks from East Prussia in the north, and a co-operative German-Slovak attack by units from the territory of the German-allied Slovakia in the south. All three assaults converged on the Polish capital of Warsaw.
The Battle of the Border included the following battles:
- Defense of the Polish Post Office in Danzig - September 1st
- Battle of Chojnice- September 1st
- Skirmish of Krojanty - September 1st
- Battle of Royal Forests - September 1st
- Battle of Mokra - September 1st
- Battle of Pszczyna - September 1-4
- Battle of Grudziądz - September 1-3
- Battle of Mława and Ciechanow - September 1-4
- Battle of Jordanów - September 2nd
- Battle of Węgierska Górka - September 1-3
- Battle of Tuchola Forest - September 1-5
- Battle of Borowa Góra - September 2-5
- Battle of Westerplatte - September 1-7
- Battle of Różan - September 4-6
- Battle of Tomaszów Mazowiecki - September 6th
- Battle of Wizna - September 7-10
- Battle of Hel - September 1st to October 2nd
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