John Calvin Commentary Isaiah 29:3

"And I will encamp against thee round about, and will lay siege against thee with posted troops, and I will raise siege works against thee." — Isaiah 29:3 (ASV)

And I will camp against you round about. By the word כדור (kāddūr) he alludes to the roundness of a ball; and the expression corresponds to one commonly used, (“Je l’environneray”), “I will surround it.” Thus he shows that all means of escape will be cut off.

And will lay siege against you. This alludes to another method of invading the city, for either attacks are made at various points, or there is a regular siege. He confirms the doctrine of the former verse and shows that this war will be carried on under God’s direction, and that the Assyrians, though they are hurried on by their passions and by the lust of power, will undertake nothing but by the command of God.

He considered it to be of great importance to carry full conviction to the minds of the Jews that all the evils which befell them were sent by God, so that they might thus be led to enter into an examination of their crimes. As this doctrine is often found in the Scriptures, it ought to be the more carefully impressed on our minds, for it is not without good reason that it is so frequently repeated and inculcated by the Holy Spirit.