The Polish Army (Polish: Wojsko Polskie) is the name applied to the military forces of Poland. The name has been in use since the early 19th century, although it can be used to refer to earlier formations as well. Polish Armed Forces consist of the Army (Wojsko Lądowe), Navy (Marynarka) and Air Force (Lotnictwo) branches and are under the command of the Ministry of National Defense (Ministerstwo Obrony Narodowej).
The first Polish Army was created in the 10th century kingdom of Poland, under the Piast dynasty. The prince's forces were composed of a group of armed men, usually mounted, named drużyna. Their key role was the protection of the monarch and supporting the taxation effort. Their organisation was similar to other such armed units of other Slavic rulers, and were often of foreign origin.
With time, the early tribal warriors gave rise to knights and eventually, by the 15th century, the whole social class of the szlachta or Polish gentry. The Polish gentry formed a distinct element within the ancient tribal groupings. This is uncertain, however, as there is little documentation on the early history of Poland, or of the movements of the Slavonic people into what became the territory so designated.
Around the 14th century, there was little difference between those called knights and those referred to as szlachta in Poland. Members of the szlachta had the personal obligation to defend the country (pospolite ruszenie), and thereby became the kingdom's privileged social class. It was them who were obliged to build and support castles as well as to keep peace and order on territory they were assigned.
Commonwealth armies were commanded by four hetmans. The armies comprised: