"Cow Cavalry," the biggest challenge is still the cost.
In the Farming Era, cows were a critical economic resource. For the majority of the time, the value of a cow exceeded that of a human.
In order to reclaim the land for agriculture, Hudson started developing animal husbandry vigorously since taking over the Mountain Domain, buying hundreds of breeding cows.
Now, the Mountain Domain has developed a herd of over a thousand cows, albeit with a large proportion being calves.
Given the need for development in the domain, not all could be drawn away. Besides, ordinary work cattle are not suitable for war.
The ones that really meet the requirements are those descendants of mutated oxen which are stronger, endurant, and more powerful.
Time, after all, is scarce. Those descendants of mutated oxen are all in the growth phase and, apart from the breeding cattle, the rest are immature.