20th Infantry Division ( pl, 20. Dywizja Piechoty) was an

infantry Infantry is a military specialization which engages in ground combat on foot. Infantry generally consists of light infantry, mountain infantry, motorized infantry & mechanized infantry, airborne infantry, air assault infantry, and marine i ...

division Division or divider may refer to: Mathematics *Division (mathematics), the inverse of multiplication *Division algorithm, a method for computing the result of mathematical division Military *Division (military), a formation typically consisting ...

of the

Polish Army The Land Forces () are the land forces of the Polish Armed Forces. They currently contain some 62,000 active personnel and form many components of the European Union and NATO deployments around the world. Poland's recorded military history stret ...

during the interbellum period, which took part in the

Polish September Campaign The invasion of Poland (1 September – 6 October 1939) was a joint attack on the Republic of Poland by Nazi Germany and the Soviet Union which marked the beginning of World War II. The German invasion began on 1 September 1939, one week after ...

. It was formed in 1920 from the reorganization of the 2nd Lithuanian-Belarusian Division. Stationed in

Baranavichy Baranavichy ( ; be, Бара́навічы, Belarusian Latin alphabet, Łacinka: , ; russian: Бара́новичи; yi, באַראַנאָוויטש; pl, Baranowicze) is a city in the Brest Region of western Belarus, with a population (as of ...

() and commanded by Colonel

Wilhelm Lawicz-Liszka Wilhelm Lawicz-Liszka was a Polish infantry officer of the Polish Legions in World War I and the Blue Army (Poland), Blue Army, a colonel of the Polish Armed Forces (Second Polish Republic), Polish Armed Forces and the Polish Armed Forces in the ...

September 1939 Campaign

In the summer of 1939 it was moved west and became part of the

Modlin Army Modlin Army ( pl, Armia Modlin) was one of the Polish armies that took part in the Polish world war 2 defence of 1939. After heavy casualties in the battle of Mława (September 1–3), the Army was forced to abandon its positions near Warsaw aroun ...

. Its task was to defend the partly fortified area north of

Mława Mława (; yi, מלאווע ''Mlave'') is a town in north-east Poland with 30,403 inhabitants in 2020. It is the capital of Mława County. It is situated in the Masovian Voivodeship. During the invasion of Poland in 1939, the battle of Mława wa ...

, near the interwar border of Poland and

East Prussia East Prussia ; german: Ostpreißen, label=Low Prussian; pl, Prusy Wschodnie; lt, Rytų Prūsija was a province of the Kingdom of Prussia from 1773 to 1829 and again from 1878 (with the Kingdom itself being part of the German Empire from 187 ...

. Between September 1 and 3, 1939 (see:

September Campaign The invasion of Poland (1 September – 6 October 1939) was a joint attack on the Republic of Poland by Nazi Germany and the Soviet Union which marked the beginning of World War II. The German invasion began on 1 September 1939, one week after ...

), the division defended positions around Mława in the

Battle of Mława The Battle of Mława, otherwise known as the Defence of the Mława position, took place to the north of the town of Mława in northern Poland between 1 and 3 September 1939. It was one of the opening battles of the Invasion of Poland (1939), Inva ...

, facing the more numerous and better equipped units of the German I Army Corps (composed of: 11th Infantry Division, 61st Infantry Division and the

Panzer Division Kempf The Panzer Division "Kempf" (german: Panzer-Division "Kempf"), also ''East Prussia Panzer Formation'' (de: ''Panzerverband Ostpreußen'') was an ''ad hoc'' combined arms formation consisting of regular German Army personnel and SS. It was creat ...

). The

Wehrmacht The ''Wehrmacht'' (, ) were the unified armed forces of Nazi Germany from 1935 to 1945. It consisted of the ''Heer'' (army), the ''Kriegsmarine'' (navy) and the ''Luftwaffe'' (air force). The designation "''Wehrmacht''" replaced the previous ...

was advancing southwards, towards

Warsaw Warsaw ( pl, Warszawa, ), officially the Capital City of Warsaw,, abbreviation: ''m.st. Warszawa'' is the capital and largest city of Poland. The metropolis stands on the River Vistula in east-central Poland, and its population is officia ...

, but first attacks were repulsed with the loss of around 25 German tanks. Unable to capture Mława in frontal attack, the Germans decided to go around and attack from sides. As they threatened 20th I.D.'s rear, the Poles were ordered to withdraw. However, supported by the neighbouring Polish 8th Infantry Division, the defenders kept their positions. On September 2, German attacks failed again, even though they ordered Polish civilians to walk in front of their tanks. The Germans decided to organize an offensive from the area of

Ostrołęka , image_flag = POL Ostrołęka flag.svg , image_shield = POL Ostrołęka COA.svg , pushpin_map = Poland Masovian Voivodeship#Poland , pushpin_label_position = bottom , subdivision_type = Country , subdivision_name = , subdivision_type1 = ...

and

Przasnysz Przasnysz (; yi, פראשניץ, russian: Прасныш) is a town in north-central Poland. Located in the Masovian Voivodship, about 110 km north of Warsaw and about 115 km south of Olsztyn, it is the capital of Przasnysz County. It h ...

. This succeeded, and on September 3, Polish positions were broken. To make matters worse, the counter-attack of the 8th I.D. was ill-organized and failed, resulting in chaotic, panic withdrawal of 8th I.D. units. Facing the difficult situation, the 20th I.D. was ordered to withdraw on the night of September 3–4. Bombed by the Germans, the division around September 7 reached the area of

Płock Płock (pronounced ) is a city in central Poland, on the Vistula river, in the Masovian Voivodeship. According to the data provided by GUS on 31 December 2021, there were 116,962 inhabitants in the city. Its full ceremonial name, according to the ...

. Then, the unit's remains entered Warsaw, helping with its defence from northwest. They capitulated together with the Warsaw garrison on September 28 (see:

Siege of Warsaw (1939) The siege of Warsaw in 1939 was fought between the Polish Warsaw Army ( pl, Armia Warszawa) garrisoned and entrenched in Warsaw and the invading German Army.Zaloga, S.J., 2002, ''Poland 1939'', Oxford: Osprey Publishing Ltd., It began with huge ...

). The Germans who fought against the 20. at Mława gave it a nickname "

Steel Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistant ty ...

Division."

Order of Battle (1939)

* Division Headquarters - based in

() * - based in Baranavichy * - based in

Slonim Slonim ( be, Сло́нім, russian: Сло́ним, lt, Slanimas, lv, Sloņima, pl, Słonim, yi, סלאָנים, ''Slonim'') is a city in Grodno Region, Belarus, capital of the Slonimski rajon. It is located at the junction of the Ščar ...

() * - based in Slonim * - based in

Pruzhany Pruzhany ( be, Пружа́ны, ; russian: Пружаны, pl, Prużana, yi, פרוזשענע, Pruzhene) is a town in Brest Voblast, Belarus. Pruzhany is the center of the district in Brest Region, Belarus. Its population is about 18,500 people. ...

()

References

20th Military units and formations established in 1920 1920 establishments in Poland 20th {{mil-unit-stub

September 1939 Campaign

Order of Battle (1939)

See also

References