On the morrow they left the horsemen to go with him, and returned to the castle:

And the next day, leaving the horsemen to go with him, they returned to the castle.

and on the morrow, having left the horsemen to go with him, returned to the fortress.

and on the morrow, having suffered the horsemen to go on with him, they returned to the castle;

The next day the infantry returned to the barracks, leaving the cavalry to proceed with him;

But on the day after, they sent the horsemen on with him, and went back to their place:

And the next day, sending the horsemen to go with him, they returned to the fortress.

and on the next day, leaving the troopers to go on with him, they returned to the Fort.

And the next day. Though Luke did not express before that the soldiers were commanded to return before they came at their way's end, yet it is certain, that they were appointed to accompany him only unto that place where the chief captain thought Paul would be safe; for he went out privily in the night. And the chief captain knew that so soon as they had finished some part of their journey, there was no farther danger, because the adversaries could have no hope to overtake him; and that it was no point of wisdom [1] to send part of the garrison far away.

Footnotes

1 - "Tutum... non esse," it was not safe.

They left the horsemen - As they were then beyond the danger of the conspirators, the soldiers who had guarded them thus far returned to Jerusalem.

On the morrow they left the horsemen - Being now so far from Jerusalem, they considered Paul in a state of safety from the Jews, and that the seventy horse would be a sufficient guard; the four hundred foot, therefore, returned to Jerusalem, and the horse went on to Caesarea with Paul. We need not suppose that all this troop did reach Antipatris on the same night in which they left Jerusalem; therefore, instead of, they brought him by night to Antipatris, we may understand the text thus - Then the soldiers took Paul by night, and brought him to Antipatris. And the thirty-second verse need not to be understood as if the foot reached the castle of Antonia the next day, (though all this was possible), but that, having reached Antipatris, and refreshed themselves, they set out the same day, on their march to Jerusalem; on the morrow they returned, that is, they began their march back again to the castle. See on Acts 24:1 (note).

On the morrow they left the horsemen to go with him,.... That is, the two hundred soldiers, and the two hundred spearmen, who were all on foot, left the seventy horsemen to conduct Paul to Caesarea; for being come to Antipatris, all danger from the Jews was over:
and returned to the castle; the castle Antonia in Jerusalem, from whence they set out.

On the morrow they--the infantry.
left the horsemen--themselves no longer needed as a guard. The remaining distance was about twenty-five or twenty-six miles.