Irregulars have several peculiarities and they are quite spread in the rulebook.
Trying to summarize, they:
- ignore difficult terrain penalty(excluding linear obstacles)
- shoot/fight normally in rough ground
- shoot/fight with a penalty in open
- cannot charge regular units (so Cossacks cannot charge a regular unit correct?)unless they or the target are in difficult ground
- have a specific line in the Change formation table
- if inherently SK2 or SK3 a unit may split into SK bases or changed for an Irregular one
...did I forget something?
Thanks
Sergio