Speed factor.

"Again, twenty-five!" :( **hunter98**, reread my first post carefully: the important thing is that the golems will be sped up only *after* the attacking hero with fast units has made their move. There's also a saying: "First come, first served!" :) In the Tower, archmages, titans, and nagas (the latter if they manage to quickly reach the enemy) usually play a decisive role in battle.
And don't forget about *berserk*: if the attacker casts it *first*, they will just laugh as the defender's large units beat each other up. :)

**Dirty_Player**, here, I think I found the map Tactician Corner 3. Take a look, is it the one?
http://www.heroesleague.ru/show/329/tc3.h3m
It is mentioned here (where I took the link from):
http://forum.heroesleague.ru/viewtopic.php?t=828&sid=32feaeb2f78730f130d91f45a84a4d48