...Deviating from my oh-so-funny humour, this is also partly why there are a few constructs applying to other mount animals; Cavalry is clearly derivated from, as Jaume pointed out, from the latin "equus". Equus Caballus is actually a biological designation for the horse, which ultimately gives the military unit as mounted on horse-back "Cavalry".

Hence the following:

Chariots: Chariotry
Camels: Camelry
Elephants: Elephantry

And finally, the beloved giraffalry.