Fire ships vs hydras

Nescius

Minotaur
It feels kinda weird that there exist a possibility of having like 1000 fire ships in a city and then one hydra with CS comes and it can happily land. Since hydras have 9 heads it should take 9 fire ships to kill it. Or if that's too low it can still be more but at least possibility of that happening ? Hydras ignoring fire ships just feels like an overlook.
 
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