Battle of Legnica
Events
in wich Poland was/is involved

Battle of Legnica

The Battle of Legnica (Polish: Bitwa pod Legnicą), also known as the Battle of Liegnitz (German: Schlacht von Liegnitz) or Battle of Wahlstatt (German: Schlacht bei Wahlstatt), was a battle which took place at Legnickie Pole (Wahlstatt) near the city of Legnica (Liegnitz) in Silesia on April 9, 1241.

A combined force of Poles and Germans under the command of Henry II the Pious, Duke of Silesia, supported by feudal nobility and knightly military orders sent by the Pope, attempted to halt the Mongol invasion of Europe. Despite the Mongol victory in the ensuing battle, this was the furthest west their forces reached due to political destabilization inside the Mongol Empire.

The joined edition from the German and Polish Post in 1991 shows a moment during the battle. The mongol warriors are wearing suits of armour and lances like there western enemies. In fact most of the mongol riders wore little protection and used handbows, like the ancient drawing (right side) shows. They didn't fight in a close formation like both, the stamp and this drawing suggest.
More information

Polonica stamps:

German Fed. Rep. 1991, 09 IV