WW2 begins with the Nazi Germany party invading Poland
Poland Forces Surrender to 10th Army
September 2, 1939
Polish forces at Wieluń surrender to the German 10th Army.
Polish Propose Attack
September 3, 1939
The Polish Poznań Army proposes an attack against the German 8th Army. The German flank is exposed, but the proposal is rejected.
Battle of Mława concludes
September 4, 1939
The Battle of Mława concludes as the Polish Modlin Army begins to retreat.
Polish Forces Surrender to 10th Army
September 5, 1939
Polish forces around Piotrków surrender to the 10th Army.
Polish Forces Regroup
September 6, 1939
Polish forces regroup along the Narew, Vistula, and San Rivers. Kraków falls to the German 14th Army.
The Siege of Westerplatte Concludes
September 7, 1939
The siege of Westerplatte concludes with the surrender of its remaining garrison. Polish supreme command relocates to Brześć from Warsaw. Defenses along the Narew begin withdrawal to the Bug River. Tarnów falls to the 14th Army.
The Siege of Warsaw begins
September 8, 2012
The Siege of Warsaw begins the land phase with the arrival of German units in the suburbs. The air bombardment had begun at the start of the Campaign. The pocket at Radom is reduced by the 14th Army.