Poland was once a decentralized state led by a weak monarchic power. The central power was subdued in favour of tycoons and nobility. The Seym performed the actual control of the state. The army comprised the Crown and Lithuanian Corps. Constant resource shortage was a typical feature of the army, which mainly consisted of a Polish division (hussars, armoured and light cavalry) and a German division of cavalry and infantry equipped by western European standards. The Hetman was in command of the army.
While Poland is standard in the 18th century, all of their 17th century units are unique. Their 17th century Pikemen have no armor, but are cheaper and faster to train. The 17th century Musketeers have a lower attack and range, but have a high rate of fire and are also faster to train. The Polish Light Rider is as well cheap and fast to train, but slow and comparably weak. The 17th century Dragoon is replaced by Mounted Noblemen, which have less hitpoints and attack, but fire faster and are also faster to train.
The most valuable of the 17th century units, and also the most representative Polish unit is the Winged Hussar. It combines the good attack, armor and cheap upgrades of the heavy cavalry with the maneuverability of hussars. It's disadvantages are the comparably low hitpoints and long training time.
With all their special units being from the 17th century, there is usually no need to rush to the 18th century. Winged Hussars are most effective in the earlier game due to their combined speed, armor and effective upgrades, but are also suitable for later stages. Their other 17th century units are comparably weak, but can be trained in large numbers.
Poland is generally a cavalry faction, so it's important to build as many stables as possible. Poland has only standard 18th century units and lacks a skirmisher unit, so ranged battles might pose a problem in the late game.
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