Scripts

Does anyone know how the startCombat function works? I'm planning to create a series of campaigns, but before that, I want to test all the scripts. Here's the thing: I saw in the manual that an enemy hero can be used as an enemy in combat, and in the fifth mission of campaign 6, the hero's stats were stored in the map file. How can I do that?;)

And a similar question about siegeTown: how do I set the city's stats?