Adam Clarke on Acts 23:23

Two hundred soldiers - Στρατιωτας, Infantry or foot soldiers.

Horsemen threescore and ten - There was always a certain number of horse, or cavalry, attached to the foot.

Spearmen - Δεξιολαβους, Persons who held a spear or javelin in their hand; from εν τῃ δεξιᾳ λαβειν taking or holding a thing in the right hand. But the Codex Alexandrinus reads δεξιοβολους, from δεξια, the right hand, and βαλλειν, to cast or dart, persons who threw javelins. But both words seem to mean nearly the same thing.

The third hour of the night - About nine o'clock p.m., for the greater secrecy, and to elude the cunning, active malice of the Jews.