Elephant VS Elephant battles

[Brave Brave Sir Robin]

I think elephants are classified as cavalry

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type indian elephant armored
dictionary indian_elephant_armored ; Armored Indian Elephants
category cavalry
class heavy
voice_type Female_1
soldier elephant_javelinmen, 18, 6, 1
mount elephant indian cataphract
mount_effect horse +4, chariot +4
attributes sea_faring, can_run_amok, frighten_foot, frighten_mounted
formation 7, 11, 13, 16, 1, square
stat_health 1, 4
stat_pri 5, 0, javelin, 57.8, 20, thrown, simple, piercing, spear, 10 ,1
stat_pri_attr thrown
stat_sec 5, 63, no, 0, 0, melee, other, blunt, none, 0 ,0.2
stat_sec_attr area, launching, ap
stat_pri_armour 14, 6, 0, metal
stat_sec_armour 30, 7, metal
stat_heat 4
stat_ground 0, 0, -5, -4
stat_mental 10, normal, trained
stat_charge_dist 30
stat_fire_delay 0
stat_food 60, 300
stat_cost 2, 15000, 5750, 270, 400, 15000
ownership romans_julii, romans_brutii, pontus

There are mounted attributes but apparently also differences between horses and elephants, and from vanilla, camels too. I'm not sure if frighten mounted refers to "mount" or "category"