Was being the operative word. 2 derbies a year for a couple of million quid?Dobbin is very effective in crowd control and was the weapon of choice in beating up football fans. (A GMP speciality)
Also protesters use marbles against horses an outdated form of beating people up.
(I always remember the battle of Barnsley where South Yorkshire finest waded into Blues at the beer counter, a mounted cop was so desperate to join in he was bent double trying to get under the low roof and inside to hit everyone)