(Let me know if you want gunpowder to be used)
The armies will function as the spanish tericos.
ARMY:
1 company-100 soldiers is commanded by a captain
1 battalion-1000 soldiers is commanded by a lieutenant colonel
1 regiment-3000 soldiers is commanded by a colonel
1 brigade-5000 soldiers is commanded by a brigade general
1 division-25000 soldiers is commanded by a divisional general
1 field army-150000 soldiers is commanded by the grand hetman
The commonwealth at max can muster 300000 soldiers
A standard soldier will have a stell brestplate and a lobster-tailed pot helmet. As for a weapon they will have a halberd or a spear and a short sword.
Cavalry:
(Mainly there will be only the winged hussars)
The winged hussars is a heavy cavalry formation active in Poland and in the Polish–Lithuanian Commonwealth. Their epithet is derived from large rear wings, which were intended to demoralize the enemy during a charge.
Their armor and weapons:
The hussar dress was ostentatious and comprised plated body armour (cuirass, spaulders, bevors, and arm bracers) adorned by gold ornaments, a burgonet or lobster-tailed pot helmet and jackboots as well as versatile weaponry such as lances, koncerz, sabres, backswords, maces, and hatchets. It was customary to maintain a red-and-white colour scheme, and to be girded with tanned animal hide. The wings were traditionally assembled from the feathers of raptors, and the angel-like frame was fastened onto the armour or saddle.
There are around 20000 thousand hussars in the commonwealth
Non-combatants(doctors,engineers,etc)
1 company-25
1 battalion-150
1 regiment-300
1 division-1000
1 field army- 10000