A THREAD FOR NEWCOMERS!

Where can I find information about the unit level? Or, roughly, what level do Bron and Vistan need to reach so that their monsters get a bonus?:)

When you open the fort, citadel, or castle (all the same building) in the city window, a window with the monster dwellings appears. The levels are as follows: 1st row - levels 1 and 2, 2nd row - levels 3 and 4, 3rd row - levels 5 and 6, 4th row - level 7. It's clear without a reference guide.