horseback

• "Le cavalier" means a man on horseback, which is not a description applicable to the parasite; "chevalier" is the French word for the member of a military order. —  Blackwood's Edinburgh Magazine - Volume 55, No. 344, June, 1844
• I consented, and soon after they returned with their father's earnest request that I should enter a-horseback: old customs, said the venerable old bashaw when, immediately afterwards, I met him in the street; old customs are abolished, enter and go out of this town a-horseback or a-foot, we desire the prosperity of this port, and that its commerce may flourish; All the people of Suse hail you as their 61 deliverer, God has sent you to us to turn the desert into (jinen afia) a fruitful garden; come, and be welcome, and God be with you. —  An Account of Timbuctoo and Housa Territories in the Interior of Africa
• Also they saw a rout of Englishmen coming down a little mountain a-horseback, and many archers with them, who brake in on the side of the duke's battle. —  Chronicle and Romance (The Harvard Classics Series)
• The dragoons immediately get a-horseback, and run for it, as they were ordered. —  Memoirs of a Cavalier A Military Journal of the Wars in Germany, and the Wars in England. From the Year 1632 to the Year 1648.
• As he was coming out of his chamber to mount a-horseback, the two fair daughters of the house came down and made him, each of them, a present which they had worked during his illness; one was two pretty and delicate bracelets, made of beautiful tresses of gold and silver thread, so neatly that it was a marvel; the other was a purse of crimson satin, worked right cunningly. —  A Popular History of France from the Earliest Times, Volume 3

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