You can remove the last troop slot from any hero at any point in the game without using any programs, in any version of the game.
Surprisingly, I couldn't find this bug on YouTube...
I knew about removing the last monster when heroes meet and when completing a quest, as well as in a battle for a town, but using the kingdom overview – that's an interesting option.:smile20:
Справочник по НоММ-4 http://handbookhmm.ru/pamyatka-dlya-heroes-iv.html
Памятка по НоММ-3 http://handbookhmm.ru/pamyatka-dlya-homm-iii.html
и HotA http://handbookhmm.ru/vyishla-obnovlennaya-pamyatka-dlya-homm-iii-hota.html