Message #29774

[Caleb]

Following several German-staged incidents (Operation Himmler), which gave German propaganda an excuse to claim that German forces were acting in self-defense, the first regular act of war took place on September 1, 1939, at 04:40, when the German Air Force (Luftwaffe) attacked the Polish town of Wieluń, destroying 75% of the city and killing close to 1,200 people, most of them civilians. Five minutes later, at 04:45, the old German battleship Schleswig-Holstein opened fire on the Polish military transit depot at Westerplatte, in the Free City of Danzig on the Baltic Sea. At 08:00, German troops, still without a formal declaration of war issued, attacked near the Polish town of Mokra; the battle of the border had begun. Later that day, the Germans opened fronts along Poland's western, southern and northern borders, while German aircraft began raids on Polish cities. 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 tertiary attack by units (Army "Bernolak") from the territory of German-allied Slovakia in the south. All three assaults converged on the Polish capital of Warsaw.

The Allied governments declared war on Germany on September 3; however, they failed to provide Poland with any meaningful support. The German-French border had a few minor skirmishes, although the majority of German forces, including eighty-five percent of their armoured forces, were engaged in Poland. Despite some Polish successes in minor border battles, German technical, operational and numerical superiority forced the Polish armies to withdraw from the borders towards Warsaw and Lwów. The Luftwaffe gained air superiority early in the campaign. By destroying communications the Luftwaffe increased the pace of the advance which overran Polish airstrips and early warning sites and causing logistical problems for the Poles. Many Polish Air Force units were now low on supplies, 98 of their number withdrew into neutral (at that time) Romania. The Polish initial strength of 400 had been reduced to just 54 by 14 September and air opposition virtually ceased.

By September 3, when Günther von Kluge in the north had reached the Vistula (some 10 kilometres from the German border at that time) river and Georg von Küchler was approaching the Narew River, Walther von Reichenau's armour was already beyond the Warta river; two days later his left wing was well to the rear of Łódź and his right wing at the town of Kielce; and by September 8 one of his armoured corps was on the outskirts of Warsaw, having advanced 225 kilometres (140 mi) in the first week of war. Light divisions on Reichenau's right were on the Vistula between Warsaw and the town of Sandomierz by September 9, while List, in the south, was on the river San above and below the town of Przemyśl. At the same time, Guderian led his 3rd Army tanks across the Narew, attacking the line of the Bug River already encircling Warsaw. All the German armies had made progress in fulfilling their parts of the Fall Weiss plan. The Polish armies were splitting up into uncoordinated fragments, some of which were retreating while others were delivering disjointed attacks on the nearest German columns.

Polish forces abandoned regions of Pomerania, Greater Poland and Silesia in the first week of the campaign. Thus the Polish plan for border defence was proven a dismal failure. The German advance as a whole was not slowed down, and the Germans moved quickly, overwhelming secondary positions. On September 10, the Polish commander in chief, Marshal Edward Rydz-Śmigły, ordered a general retreat to the southeast, towards the so-called Romanian bridgehead. Meanwhile, the Germans were tightening their encirclement of the Polish forces west of the Vistula (in the Łódź area and, still farther west, around Poznań) and also penetrating deeply into eastern Poland. Warsaw, under heavy aerial bombardment since the first hours of the war, was attacked on September 9 and was put under siege on September 13. Around that time, advanced German forces had also reached the city of Lwów, a major metropolis of eastern Poland. 1,150 German aircraft bombed Warsaw on September 24.

The largest battle during this campaign, the Battle of Bzura, took place near the Bzura river west of Warsaw and lasted from September 9 to September 19. Polish armies Poznań and Pomorze, retreating from the border area of the Polish Corridor, attacked the flank of the advancing German 8th army, but the counterattack failed after initial success. After the defeat, Poland lost its ability to take the initiative and counterattack on a large scale. German air power was instrumental during the battle. The Luftwaffe's offensive broke what remained of Polish resistance in an "awesome demonstration of air power". The Luftwaffe quickly destroyed the bridges across the Bzura river. Afterward the Polish forces were trapped out in the open, and were attacked by wave after wave of Stukas, dropping 50 kg 'light bombs' which caused huge numbers of casualties. The Polish flak positions ran out of ammunition and they retreated to the forests but were then 'smoked out' by the Heinkel He 111 and Dornier Do 17s dropping 100 kg incendiaries. The Luftwaffe had left the Army with the simple task of mopping up survivors. The Stukageschwaders alone dropped 388 tonnes of bombs during this battle[28].

The Polish government (of president Ignacy Mościcki) and the high command (of Marshal Edward Rydz-Śmigły) left Warsaw in the first days of the campaign and headed southeast, arriving in Brześć on September 6. General Rydz-Śmigły ordered the Polish forces to retreat in the same direction, behind the Vistula and San rivers, beginning the preparations for the long defence of the Romanian bridgehead area.