I believe the donkeys are mules.
Yep this isn't Shrek.......
And like the tag at the bottom of M&T's posts say........ "Smokin' my pipe on the mountings, sniffin' the mornin'-cool,
I walks in my old brown gaiters along o' my old brown mule,
With seventy gunners be'ind me, an' never a beggar forgets
It's only the pick of the Army that handles the dear little pets - 'Tss! 'Tss!
From......"The Screw Guns" by Rudyard Kipling"