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Yes, the advantages of tactics are known, but Valiska also often comes up with tactics, and what bonus does Turis have? 1 to movement for all cavalry, 1 to attack, and 1 to defense for 6 levels, or something like that. It doesn't seem very convincing...
I decided to check the battle using the Heroes III Combat Simulator – it works without taking into account the hero bonus (and tactical maneuvers, respectively). So, it shows that after the battle, 70% of the archers remain alive.
Техника в руках индейца мертва.
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
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