The most challenging maps for you.

Going back to the hit-and-run tactic with Berserk.
I was still curious to try out the suggested tactic in practice. On the same map, "Undead Apocalypse," against Salamandre. Below are the results of each attack:
1. 5937 trolls, 1398 firebirds, and 50 azure dragons were killed.
2. 2826 trolls, 1345 firebirds, and 10 azure dragons were killed; there are no more trolls!
Note that between our attacks, the enemy manages to divide his army into 6 stacks each time; this is worse for us, especially when only azure dragons and snipers remain.
3. 3559 diamond golems and 1009 firebirds were killed; there are no more firebirds!
4. 3607 diamond golems and 3 azure dragons were killed.
5. 1477 diamond golems were killed; there are no more diamond golems!
6. 4195 gold golems and 7 azure dragons were killed.
7. 3658 gold golems were killed; there are no more gold golems!
8. 2071 snipers were killed.
9. 1726 snipers were killed.
10. 1438 snipers were killed.
11. 1199 snipers were killed.
12. 999 snipers were killed.
13. 832 snipers were killed.
14. 693 snipers were killed.
15. 578 snipers were killed.
16. 482 snipers were killed.
17. 401 snipers were killed.
18. 334 snipers were killed.
I could continue, but it's clear that now the damage dealt in one attack is not as great, and it gets smaller each time.
The main thing is that after this, I tried several times to fight Salamandre with my main hero and the entire accumulated army, but he still wins! :(
Here's what Salamandre and my main hero look like now: