Tarczownicy
(pol 'shield warriors' or 'shield wielders'). These infantrymen from 10th-11th centuries were levied from tribal freemen in times of war, and provided bulk of early armies. Their armament consisted of shield (oval or kite), spear, and sometimes axe or javelin, and main purpose of these undisciplined troops was to defend centre and give room of manoeuvre to cavalry.
Myśliwi
(pol 'hunters')
Łucznicy Grodowi
(pol. 'town archers') medium infantry garrisoning towns, armed with bows, shields, axes and clubs.
Piechota Grodowa
(pol. 'town infantry') Unlike Tarczownicy, these slodiers are semi professional warriors that receive payment for their services, and are serving as garrisons of most important towns of early Polish state. They include significant number of foreign mercenaries in their ranks. They are much better equiped (helmets, mail, hardened leather), better trained, but also much more expensive.
Lekka Jazda Plemienna'
(pol. 'light tribal cavalry'). Smaller component of tribal levy than Tarczownicy, these horsemen act as skirmishers and ambushers.
Topornicy
(pol. 'axemen'). Semi-professional medium infantry from town garrisons, armed with two handed axes.
Pancerni
(pol. 'armoured'). Similarily to 'Piechota Grodowa' they are mix of mercenaries, and local professional warriors. Primary heavy cavalry of early Polish dukes/kings.
Wczesni Rycerze
(pol. 'early knights'). This unit represent change in military and political structure of Poland from tribal to feudal, that started by the end of 11th century. Polish rulers began to pay their best soldiers in land, instead of gold, and thus - pancerni/drużyna warriors slowly evolved into class of knights. This is also accompanied by change of armament - mail is more common (also covers legs), and round shield is replaced by kite shield. *I`ve not decided yet whether to make them seperate unit, or just armour upgrade for Pancerni.
Drużyna Książęca
(pol. 'Ducal Druzhyna'). These elite professional warriors serve as bodyguards, and best heavy cavalry at Polish disposal. They wear finest suits of armour (mail,scale), distinctive 'szłom' eastern style helmets, and use best weapons.