Well done
Not a sw but the Missouri boat ride scene in Josey Wales with the horses swimming also comes to mind. (Spit!)
But I think it looks more painfull for the guy falling of the horse!
On the āMajor Dundeeā (extended edition) DVD, there is a vintage featurette on some of the stunt-work called āRiding for a Fallā. It spends the whole time talking about how dangerous it is for the stuntmen while the horses donāt even get a mention.