system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do police (or in older times, military) horses not panic when in a dangerous situation?

Edit: Are horses also specifically bred for these kinds of scenarios?
gpt
They are trained not to. If you put a normal horse in a crowd of screaming people then it would be very nervous and panic, much like a person might. If instead you train that horse to be unconcerned by a lot of people screaming nearby, such as by gradually introducing it to loud sounds and nearby movement, then it won't panic.

On the battlefield if you want a warhorse to not react to muskets firing nearby then you need to spend a lot of time before that battle with the horse firing muskets and reassuring it that everything is OK.