"A cavalry charge can only succeed...

[Ivan]

I'm not sure there were many if any large scale cavalry charges in WW1. I was always under impression the charge of the 21st Lancers was the last great cavalry charge. That was a massacre and they were facing native troops. Winston Churchill was involved. Having a quick look on the net there seems there were some in WW1 but mostly of a small scale, horses mostly being used for transport.

According to this site the charge in Mons was one and another in 1918 that left only four horse alive.

http://www.historylearningsite.co.uk/hor...ar_one.htm