The general siege vehicle is made of wood, and the overall structure resembles a spire-roofed wooden house, which is unusually strong, with four or six wheels underneath; It was covered with cowhide or sheepskin, and was even reinforced with metal plates to protect against the destruction of the defenders. In order to prevent fire, mud is often poured on it.

The main weapon of the siege vehicle is a thick log suspended from a beam with a rope or iron chain inside, with a metal cap at the back end of the log and a metal head at the front end, which is mostly made into a sheep's head shape, called a battering ram. During the siege of the city, the soldiers in the siege vehicle grabbed the battering ram and moved backwards and slammed into the city gate, relying on inertia and kinetic energy to destroy the city gate or the latch structure behind the gate.

The appearance of the siege vehicle in this article is a little later than the thunderbolt car, and I personally think that it is mainly the Northern Mongolia to the Eastern Han Dynasty, mainly the offensive, but almost all of them are in Shuangshan Pass, for a nomad, the siege with the siege vehicle is just a burden.

But between the Eastern Han Dynasty and the Southern Barbarians, there was a long period of subordination, so there was no war. Most of the wars between Persia and the Nanban took place in the forest, and the walls of the Nanban cities were relatively short in the early stage, and they could be broken with war elephants, so they were not used much.

But in the later stages of the war, when the four countries were in a scuffle, this simple but most effective siege machine would definitely become a kind of main force.