Battle of the BzuraMap showing the Polish assault southwardsThe Battle of the Bzura (or Kutno or Battle of Kutno — German name) was a battle in the opening campaign of World War II during the 1939 German Invasion of Poland, fought between 9 and 19 September, 1939, between Polish and German forces. Finally, the Germans outflanked the Polish forces and took all of western Poland.
It was the single largest battle in the 1939 September campaign and took place to
the west of Warsaw, near
the Bzura River. In it, a Polish breakout attack gained initial success but eventually faltered after a concentrated German counterattack.
It is also noted as one of the last major military actions ever to have been conducted on horseback and was a major battle in the German campaign of Poland.
Battle of the Bzura: Polish cavalry in Sochaczew in 1939BackgroundThe Polish plan for defense against the German invasion,
Plan West, called for
the defense of the borders. This was dictated more by political than military concerns, as Poles feared that the Germans, after taking over territories they lost in
the Treaty of Versailles, would try to end the war and keep those territories. While defending the borders was more risky,
the Poles were counting on the British and French counteroffensive (which never came). Due to this,
Army Pomorze under general
Władysław Bortnowski found itself in
the Polish Corridor, surrounded by German forces on two fronts, and
Army Poznań under general
Tadeusz Kutrzeba was pushed to the westernmost fringes of the Second Polish Republic, separated both from its primary defensive positions, and from other Polish Armies.
Major general Władysław Bortnowski (1891 – 1966)General Tadeusz Kutrzeba (15 April 1885 - 8 January 1947) The German offensive proved the folly of the border defense plan in the first days of the war.
Army Pomorze was defeated in the battle of
Bory Tucholskie, and forced to retreat towards the south-east.
Army Poznań, meanwhile, although not facing heavy German assaults, was forced to retreat east due to defeats of its neighbours (
Army Pomorze in the north and
Army Łódź in the south); both of them were retreating, meaning that
Army Poznań was in danger of being flanked and surrounded by the German forces. On 4 September,
Army Poznań moved through the city it was named after,
Poznań, and abandoned it to the enemy, even through at this point it was not in contact with any significant German forces. By 6 September,
Armies Pomorze and
Poznań had linked up, forming the strongest Polish operational unit in the campaign, and general
Bortkowski accepted the command of general
Kutrzeba.
On 7 September, Polish forces became aware of the German push towards Łęczyca, which if successful could cut off the retreat route of Polish forces. By 8 September, advanced German troops reached
Warsaw, marking the beginning of the siege of the Polish capital. At the same time, German forces had lost contact with
Army Poznań, and German command assumed that the army must have been transported by rail to aid Warsaw's defense; they were unaware that in fact
Army Poznań had merged forces with
Army Pomorze, which they considered, since its defeat at Bory Tucholskie, no longer a significant threat. On 8 September the Germans were certain that they had eliminated major Polish resistance west of Vistula and were preparing to cross it and engage the Polish forces on the other side.
Meanwhile, general
Kutrzeba and his staff officers had suspected, even before the German invasion, that it would be the neighbouring Armies that would bear the German attack, and had developed plans at an offensive towards the south, to relieve Army Łódź. In the first week of the campaign, those plans, however, were rejected by the Polish commander-in-chief, Marshal
Edward Rydz-Śmigły. By 8 September
Kutrzeba had lost contact with
Rydz-Śmigły, who had relocated his command center from
Warsaw to
Brest; due to these factors,
Kutrzeba decided to go forward with his plan. His situation was dire, as German forces were close to surrounding his units: the
German 8th Army had secured the southern bank of
the Bzura river, and the
German 4th Army had secured the northern bank of
Vistula, from
Włocławek to
Wyszogród, and its elements were attacking the rear of the
Armies Pomorze and
Poznań from the direction of
Inowrocław and crossing
the Vistula river near Płock.
Opposing forcesPolish forces consisted of
Army Poznań and
Army Pomorze. German forces included
the 8th Army under
Johannes Blaskowitz and 10th Army under
Walther von Reichenau of Army Group South (
Heeresgruppe Süd), elements of the 4th Army under
Günther von Kluge of the Army Group North (
Heeresgruppe Nord) and air support (
Luftflotte 1 and
Luftflotte 4).
The Luftwaffe invades Poland, 3 September 1939.The battleThe battle can be divided into 3 phases:
Phase I — Polish offensive towards Stryków, aiming at the flank of the German 10th Army (9–12 September)[1]
Phase II — Polish offensive towards Łowicz (13–15 September)
Phase III — German counterattack and eventual defeat of the Poles, with the latter's withdrawal towards Warsaw and Modlin (16–19 September)
A brigade of Polish cavalry during the battle.On the night of 9 September, the Polish Poznań Army commenced a counterattack from the south of
the Bzura river, its target being the German forces from the
8th Army advancing between
Łęczyca and
Łowicz, towards
Stryków. The commander of
Poznań Army,
Tadeusz Kutrzeba noticed that the German
8th Army, commanded by general
Johannes Blaskowitz, was weakly secured from the north by only
the 30th Infantry Division stretched over a 30 kilometre defensive line while the rest of the army was advancing towards
Warsaw. The main thrust of the Polish offensive were the units under general
Edmund Knoll-Kownacki, known as
the Knoll-Kownacki Operational Group (Polish 14th, 17th, 25th and 26th Infantry Divisions). The right wing of the offensive, in
the area Łęczyce, included
the Podolska Cavalry Brigade under general
Stanisław Grzmot-Skotnicki, and on the left, advancing from
Łowicz to
the area of Głowno, the
Wielkopolska Cavalry Brigade under general
Roman Abraham. These groups managed to inflict considerable losses on the German defenders from
the 30th Infantry Division and
the 24th Infantry Division, which included some 1,500 German soldiers killed and wounded in action and 3,000 taken prisoner during the initial push. Cavalry brigades pushed the Germans by advancing towards vulnerable flanks and disorganizing the rear. They also successfully used
TKS and
TK-3 reconnaissance tanks.
The German forces were thrown back approximately 20 kilometres south of their original positions and the Poles recaptured several towns, including
Łęczyca and
Piątek, and the
Góra Świętej Małgorzaty village. On 10 September, the Polish
17th Infantry Division met the German
17th Infantry Division at
Małachowicze. On 11 September Polish forces were continuing their offensive, advancing on
Modlna,
Pludwiny,
Osse and
Głowno.
Polish 18th Infantry Regiment advancing during the battleInitially underestimating the Polish advance, on 11 September the Germans soon decided to redirect the main force of the German 10th Army, the German 4th Army, the reserves of the Army Group South, and aircraft from 4th Air Fleet towards the Bzura. The redirected forces included the German 1st Panzer Division, German 4th Panzer Division and the 1st SS Division Leibstandarte SS Adolf Hitler. German air superiority became apparent, and Polish movements during the day were significantly hindered. The following day the Poles reached the line
Stryków-Ozorków. On the same day General
Tadeusz Kutrzeba learned that units of
Army Łódź had retreated to the stronghold of
Modlin Fortress. Upon hearing this,
Kutrzeba decided to stop the offensive and instead tried to break through towards
Warsaw, through
Sochaczew and
Kampinos Forest. This marked the end of the first phase of the battle.
On the morning of 14 September, General
Władysław Bortnowski's group began
the second phase of the battle.
The 26th and 16th Infantry Divisions crossed
the Bzura near
Łowicz and the Polish
4th Infantry Division reached the road linking
Łowicz with
Głowno. At this point however,
Bortnowski was informed that the German
4th Panzer Division was withdrawing from its positions on the outskirts of
Warsaw. Fearing that this Panzer division posed an immediate threat to his men, he ordered
the 26th Infantry Division to retreat.
The aftermath of a bombing of a Polish column, with Bofors AA gun in the foregroundOn 15 and 16 September,
Army Pomorze took up defensive positions on the northern bank of the
Bzura. General
Stanisław Grzmot-Skotnicki's group was located between
Kutno and
Żychlin, General
Michał Karaszewicz-Tokarzewski's units near
Gąbin, and parts of
Army Poznań by the
Bzura near
Sochaczew, were ready to commence their drive towards
Warsaw. To encircle and destroy the Polish forces, the Germans engaged most of their own
10th Army, including two armoured, one motorized, and three light divisions, equipped with some
800 tanks altogether. The attack from all sides on Polish positions started on 16 September, with the support of
the Luftwaffe. On 15 September Poles were forced out of
Sochaczew, a town on the Bzura river, and trapped in a triangle of
Bzura,
Vistula and
German forces. The German
1st Panzer Division, after crossing
the Bzura between
Sochaczew and
Brochów and engaging the Polish
25th Infantry Division managed to capture
Ruszki, but its advance was then halted. Poles began to cross
Bzura near
Vistula, north of
Sochaczew, and retreat towards
Warsaw. Polish forces were forced to abandon most of their heavy equipment while crossing the river. On 17 September, German heavy artillery was shelling the crossing north of
Brochów, and the largest air operation of the campaign begun, with
Luftwaffe attempted to bomb and paralyze Polish forces.
During the night of 17 September, the main forces of
Army Poznań attacked the German forces in order to break out of the German encirclement between
Witkowice and
Sochaczew. The 15th Infantry Division and Podolska Cavalry Brigade again crossed the Bzura in Witkowice. In Brochow, the 25th and 17th Infantry Divisions crossed the Bzura river. The 14th Infantry Division was concentrated in Łaziska. At the same time, Army Pomorze marched towards the villages of Osmolin, Kierozia and Osiek.
In the morning the Germans started their drive towards the south along both banks of the Bzura, supported by more than 300 aircraft and heavy artillery. German howitzers, taking advantage of their position on the high ground of the Vistula's right bank, shelled Polish positions for the entire day. And after two days of heavy fighting, with no ammunition or food rations remaining, further attempts at a breakout for the Poles became impossible.