'Horseback' in the Bible

So there went one on horseback to meet him; and he said, Thus saith the king: Is it peace? And Jehu said, What hast thou to do with peace? turn thee behind me. And the watchman told saying, The messenger came to them, and he does not return.

And he sent out a second on horseback; and he came to them and said, Thus saith the king: Is it peace? And Jehu said, What hast thou to do with peace? turn thee behind me.

And he wrote in the name of king Ahasuerus, and sealed it with the king's ring, and sent letters by couriers on horseback riding on coursers, horses of blood reared in the breeding studs: