Four Brothers

A group of four brothers did travel the land, with only one steed shared among the whole band.
Though always surefooted, no matter the weather, their mount would go lame if they didn’t ride together.
When one of the brothers was thrown and misplaced, he was left where he lay and was quickly replaced.
When the ride became old and the brothers not needed, to a game for all ages they simply retreated.
When many a player would fling them about, and ringing a post was the victory shout.
Who are we?