Strážci Hranic (Frontier Guards)
Light infantry who served as frontier guards. They were free men whose only lord was the duke/king himself.
Knížecí Družina (Prince's Suit)
Unlike in Western Europe, the duke’s personal suit numbered several hundred men. In the 11th century it was thousands, but by early 12th this had been reduced to "mere" hundreds. These men were essentially the predecessors of the Czech nobility.
Čeští Lučištníci (Bohemian Archers)
The Avars brought the composite reflexive bow to central Europe in 6th century which the Bohemians were quick to adopt, though on foot. Their specialty was the use of poisonous arrows; one hit by such an arrow would quickly dispatch any opponent who did not have the antidote immediately at hand.
Opěšalá Knížecí Družina (Dismounted Prince's Suit)
As with Western Knights, occasionally situations would arise when it was preferable for the Knížecí Družina to fight on foot.
Credits:
Pacco: Most textures and the Bohemian shield model
Sumskilz: Models, Družina face textures, and some textures on the Čeští Lučištníci upgrade
Rusichi Mod: Several face textures and parts used for the models
Resurrection: Unit concepts and research