Matthew Poole and continuators on John 18:3

3 Judas then having received a band of men, and officers from the chief priests and Pharisees, cometh thither with lanterns, and torches, and weapons .

The Evangelist here passeth over all mentioned by the other Evangelists, about Iudas his going to the High Priests, and contracting with them, and cometh to relate his coming to apprehend him with a band of men that he had obtained from the chief Priests and Pharisees for that purpose. By band, we must not understand a Roman Cohore, as the word signifies, but such a convenient number out of that band, (probably) which at the time of the Passover, guarded the Temple, as was sufficient to take him, they came with lanterns, and torches, (tho it were the time of full moon) to make the stricter search; and with Arms, fearing where no fear was; for Iudas (their leader) could have told them, that he was not wont to go with any great company to the Mount of Olives.

Marginal references: Matth. 26.47. Luke 22.47. Acts 1.16.