Gameplay
Horses should be able to carry one rider, and one person on the back of the horse that can either not attack or at least able to use a small arm. IE officers/Engineers
Horses should have a low health score around 200 atleast able to take atleast limited small arms fire Very limited
But machine gun fire should absloutely instakill a horse with no question, Gas and artilery should be an insta kill.
Cavalry, should not be heavily armored or be at all resistant to barbed wire. Horses should absloutely get entangled in that stuff it shouldn't even be a question. But it should be more so that atleast 9 to 5 cavarly can be played in any match or round with 250 matches offering 10 to 15 to be playable. Offering atleast more classes for people to play as admits a game and cavarly charges could absolutely do a thing. And at least two playstyles should absolutely be offered.
There should be a high accuracy penality whilst shooting and moving, Horses should have a chance to freak the fuck out if something explodes right next to you, and it bucks you.
Different breeds of horse should be a thing, if you die and the horse doesn't any one should have the ability to get on that horsey.
The first being a Mounted Infantry/Mounted Rifleman
Style of gameplay, where your primary is a bolt action rifle/revolver. Where it is incentivized to either fight on the back on the back of your horse. Or to cooperate with your fellow horsemen and to flank around the battle and attack the enemy from behind or atleast a flank. So they are limited in their ability to defend/ attack a point making another point of attack. But on their own cannot take the enemy head on.
But operating in tandem with Infantry and officers allowing an engineer to ride on the back of a horse slightly reducing its speed. But allowing horsemen to work with ones team and offer even greater flanks and a semi all terrain vehicle that slightly struggles with trenches but less so than motor bike.