Walkthroughs for custom maps.

There are also conventional methods; you can run Heroes on a virtual machine and periodically take snapshots during battles.

This method was described 11 years ago: 😮
/topic/at/192301/
However, I haven't heard of anyone actually using it. In general, for farming morale, this is definitely cheating. But for such long battles, it's a normal safety net.

Without turbo animation.

What prevents its use? It greatly speeds up the process. You can complete 4-5k rounds in an hour.