Adam Clarke on 2 Chronicles 26:15

Engines - to shoot arrows and great stones - The Targum says, "He made in Jerusalem ingenious instruments, and little hollow towers, to stand upon the towers and upon the bastions, for the shooting of arrows, and projecting of great stones."

This is the very first intimation on record of any warlike engines for the attack or defense of besieged places; and this account is long prior to any thing of the kind among either the Greeks or Romans. Previously to such inventions, the besieged could only be starved out, and hence sieges were very long and tedious. Shalmaneser consumed three years before such an inconsiderable place as Samaria, 2Kgs 17:5, 2Kgs 17:6; Sardanapalus maintained himself in Nineveh for seven years, because the besiegers had no engines proper for the attack and destruction of walls, etc., and it is well known that Troy sustained a siege of ten years, the Greeks not possessing any machine of the kind here referred to. The Jews alone were the inventors of such engines; and the invention took place in the reign of Uzziah, about eight hundred years before the Christian era. It is no wonder that, in consequence of this, his name spread far abroad, and struck terror into his enemies.