'Cavalry' in the Bible

He summoned two of his centurions and said, “Get 200 soldiers ready with 70 cavalry and 200 spearmen to go to Caesarea at nine tonight.

The next day, they returned to the barracks, allowing the cavalry to go on with him.

and, the cavalry having reached Caesarea and delivered the letter to the Governor, they brought Paul also to him.

The number of cavalry troops was 200,000,000. I heard how many there were.