4 occurrences in 10 translations

'Horseback' in the Bible

clothed in blue cloth, governors and prefects, {handsome young men} [and] all of them horsemen, {experts on horseback}.

The Babylonians and all the Chaldaeans, Pekod and Shoa and Koa, and all the Assyrians with them: young men to be desired, captains and rulers all of them, and chiefs, her neighbours, all of them on horseback.

And they will come against you from the north on horseback, with war-carriages and a great band of peoples; they will put themselves in order against you with breastplate and body-cover and metal head-dress round about you: and I will make them your judges, and they will give their decision against you as seems right to them.

And you will come from your place in the inmost parts of the north, you and a great number of peoples with you, all of them on horseback, a great force and a strong army:

Bible Theasaurus

Reverse Interlinear

Strong's
Root Form
Definition
Usage
סס סוּס 
Cuwc 
Usage: 140

רכב 
Rakab 
Usage: 78

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain