Conditions for recruiting units.

Hello, fellow Heroes fans! *I just found your forum.* I used to play this wonderful game a long time ago, and now I'm getting back into it. I'd like to know if anyone has information about the conditions for recruiting units. I know that for this to happen, the recruited army must not consist of elementals, and its strength must be 2 times or more less than yours (i.e., the product of the sums of attack*defense*hitpoints...). But I've also heard that, for example, free recruitment depends on the types of troops. For example, if there are fast "infantry" units in the army, such as cavalry, then there is a higher chance that slow infantry units, such as giants, will join you. What do you