Lay siege against it - The prophet is represented as doing that which he portrays. The leading features of a siege are depicted. See the Jeremiah 6:6 note.

The camp - Encampments. The word denotes various hosts in various positions around the city.

Fort - It was customary in sieges to construct towers of vast height, sometimes of 20 stories, which were wheeled up to the walls to enable the besiegers to reach the battlements with their arrows; in the lower part of such a tower there was commonly a battering-ram. These towers are frequently represented in the Assyrian monuments.

Battering rams - Better than the translation in the margin. Assyrian monuments prove that these engines of war are of great antiquity. These engines seem to have been beams suspended by chains generally in moveable towers, and to have been applied against the walls in the way familiar to us from Greek and Roman history. The name "ram" was probably given to describe their mode of operation; no Assyrian monument yet discovered exhibits the ram's head of later times.

Battering rams - כרים carim. This is the earliest account we have of this military engine. It was a long beam with a head of brass, like the head and horns of a ram, whence its name. It was hung by chains or ropes, between two beams, or three legs, so that it could admit of being drawn backward and forward some yards. Several stout men, by means of ropes, pulled it as far back as it could go, and then, suddenly letting it loose, it struck with great force against the wall which it was intended to batter and bring down. This machine was not known in the time of Homer, as in the siege of Troy there is not the slightest mention of such. And the first notice we have of it is here, where we see that it was employed by Nebuchadnezzar in the siege of Jerusalem, A.M. 3416. It was afterwards used by the Carthaginians at the siege of Gades, as Vitruvius notes, lib. 10 c. 19, in which he gives a circumstantial account of the invention, fabrication, use, and improvement of this machine. It was for the want of a machine of this kind, that the ancient sieges lasted so long; they had nothing with which to beat down or undermine the walls.

And lay siege against it,.... In his own person, as in Ezekiel 4:3; or draw the form of a siege, or figure of an army besieging a city; or rather of the instruments and means used in a siege, as follows:

and build a fort against it: Kimchi interprets it a wooden tower, built over against the city, to subdue it; Jarchi takes it to be an instrument by which stones were cast into the city; and so the Arabic version renders it, "machines to cast stones"; the Targum, a fortress; so Nebuchadnezzar in reality did what was here only done in type, 2 Kings 25:1; where the same word is used as here:

and cast a mount about it; a heap of earth cast up, in order to look into the city, cast in darts, and mount the walls; what the French call "bastion", as Jarchi observes:

set the camp also against it; place the army in their tents about it:

and set battering rams against it round about; a warlike instrument, that had an iron head, and horns like a ram, with which in a siege the walls of a city were battered and beaten down. Jarchi, Kimchi, and Ben Melech, interpret the word of princes and generals of the army, who watched at the several corners of the city, that none might go in and out; so the Targum seems to understand it (b). The Arabic version is, "mounts to cast darts"; See Gill on Ezekiel 21:22.

(b) So R. Sol. Urbin. Ohel Moed, fol. 50. 9.

And lay siege against it, and build a fort against it, and cast a mount against it; set the camp also against it, and set battering rams against it round about.

4:2 Lay siege - Draw the figure of a siege about the city. Build - Raise a tower and bulwarks.

battering...: chief leaders

2. fort-rather, "watch-tower" (Jer 52:4) wherein the besiegers could watch the movements of the besieged [Gesenius]. A wall of circumvallation [Septuagint and Rosenmuller]. A kind of battering-ram [Maurer]. The first view is best.

a mount-wherewith the Chaldeans could be defended from missiles.

battering-rams-literally, "through-borers." In Eze 21:22 the same Hebrew is translated "captains."

4:1-8 The prophet was to represent the siege of Jerusalem by signs. He was to lie on his left side for a number of days, supposed to be equal to the years from the establishment of idolatry. All that the prophet sets before the children of his people, about the destruction of Jerusalem, is to show that sin is the provoking cause of the ruin of that once flourishing city.