What makes units able to ride on horses?

[Epistolary Richard]

I am not at all clear what you are doing with this.....

Just to make things clear this is what Emperor Umeu 1 was saying, it's taken from a post from a very similar thread on in the twc workshop.

Ok, problem is more or less solved.

It turns out that if you want a unit to have multiple possibilities, such as on foot or mounted, you must include all the others - like elephant, chariot and camel, even if you're never going to use them. So

type roman_centurion
skeleton fs_dagger

AND

type roman_standard
skeleton fs_standard_bearer

NEEDED TO BECOME:

type roman_centurion
skeleton fs_dagger
skeleton_horse fs_hc_swordsman
skeleton_elephant fs_forest_elephant_rider
skeleton_chariot fs_chariot_sword
skeleton_camel fs_hc_swordsman

AND

type roman_standard
skeleton fs_standard_bearer
skeleton_horse fs_hc_swordsman
skeleton_elephant fs_forest_elephant_rider
skeleton_chariot fs_chariot_sword
skeleton_camel fs_hc_swordsman