Polish 1st Legions' Infantry Division

1st Legions Infantry Division
Symbol of the division in modern NATO code
Active	1919-1944
Country	Poland
Branch	Land forces
Type	Infantry, later partisan infantry
Size	ca. 16,000 men
Garrison/HQ	Wilno
Nickname(s)	Iron Division
Patron	Józef Piłsudski
Engagements	Dyneburg, Kiev Offensive, Battle of Warsaw, Invasion of Poland
Commanders
Notable commanders	Edward Rydz-Śmigły, Wincenty Kowalski

Polish 1st Legions Infantry Division (1. Dywizja Piechoty Legionów) was a tactical unit of the Polish Army between the World Wars. Formed on February 20, 1919, partially of veterans of the I Brigade of the Polish Legions, the unit saw extensive action during the Polish-Bolshevik War and World War II. Regarded by the soldiers of the Wehrmacht as the Iron Division, it distinguished itself in the Invasion of Poland.

As one of the most experienced and best equipped Polish divisions, it fought in many of the most notable battles of the Polish-Bolshevik War of 1919 and 1920. Among them was the operation of liberation of Wilno and Battle of Dyneburg in Daugavpils, Latvia (as part of Rydz-Śmigły's Third Army and under his personal command, although the actual commanding officer was Michał Karaszewicz-Tokarzewski). During the Kiev Offensive of spring of 1920, the division formed the core of Rydz-Śmigły Operational Group and took part in the battle of Zhytomyr (April 25), capturing the city of Kiev itself (May 7). After the Polish withdrawal, the unit took part in heavy retreat battles and shielded the retreat of the rest of the Polish forces. After several clashes with the 1st Cavalry Army, the division broke off and reached the area of the Wieprz River, from where it started the counter-offensive during the Battle of Warsaw (see Battle of Dęblin and Mińsk Mazowiecki). On the second day of the Polish offensive, August 16, the division managed to outflank the Bolshevik Mozyr Group by a forced march of over 56 kilometres. After that the division, commanded by Stefan Dąb-Biernacki, was attached to the Second Army and took part in the second biggest battle of the war, the Battle of the Niemen River. During the battle, the unit formed core of the Wilno Group and took part in a successful outflanking manoeuvre of the Bolshevik forces centered on the city of Grodno.