Riders
what is a fight on a horseback called
a unit of soldiers mounted on horseback is called what
warriors who fought on horseback were called knights
Polo on horseback is called just that. Polo.
Riders
Horseback
Formally, an "equestrienne". Generally, all horseback riders are called "equestrians".
They are usually called the cavalry, and it is when a soldier rides to battle on horseback, and usually the soldier will fight on horseback.
neck reining
That is cavalry.
He is called a "Rejoneador". See the related link.
He is called a "Rejoneador". See the related link.