John Gill Bible Commentary

Arise, and let us go up by night,.... Since they could not take the city at noon, and by day, as they expected, they propose to attempt it by night; they would lose no time, but proceed on, day and night, until they had accomplished their end; this shows how much they were resolved upon it, and that nothing could discourage from it; and that they were sure of carrying their point: and therefore it follows, and let us destroy her palaces; the tower and strong hold of Zion, the temple of Jerusalem, the king's palace, the houses of the high priest, judges, counsellors, and other civil magistrates, as well as the cottages of the meaner sort of people; for the Vulgate Latin version renders it, "her houses"; which, notwithstanding her strong walls, were not secure from the enemy.