[Tournaments-HotA] Urfin Jus and his wooden soldiers

There's a question regarding the rules, specifically diplomacy. Is it possible to recruit level 6 and 7 units and immediately dismiss them? There are cases where disgruntled monsters decide to attack you relentlessly. However, this doesn't always result in extra experience, especially against a large number of level 7 units or a hundred wizards, for example.