I give up, you finally won me over

[PvK]

Supply can be increased by building fortresses. Supply spreads to adjoining provinces from them.

Supply use can be reduced by magic items which provide supply. E.g. Bag of Wine, one per commander, reduces supply use in province by 25.

Heroes are often very useful, and there are specific national ones for each nation. Some other characters (sometimes with troops) appear for all nations at random too. Some of the mercenaries are also quite useful. The chance is mostly based on your Luck scale. If you want, there are threads here with more details.

PvK