Hell on Wheels

Hell on Wheels is one of the 4 missions from the March of the Machines. In this mission, Ezio travels to Monte Circeo, in order to destroy one of Da Vinci's most powerfull Machines: The Tank.

Infiltrating Monte Circeo
Arriving in the Borgia-occupied settlement, Ezio sought the engineer. Though he located the man in the outskirts of the fortress, he was protected by a bodyguard, preventing the Assassin from extorting any information from him. He thus merely tailed him from behind, listening to his target converse with his guard, regarding the machine's safety.

As the engineer entered the heavily guarded factory, Ezio quickly took an alternative route up the eastern walls, through a damaged section in the stones. Dropping down to where the engineer was standing, he confronted him, and soon discovered that the machine required three people to operate it, and that three mercenaries were being held captive in the fortress for such a purpose.

Finding a Crew
Ezio allowed the engineer to escape, and proceeded to make his way to the opposite end of the factory. Finding the plans at a small workshop, Ezio burned them using a torch, and made his way to the captured mercenaries. Dispatching the patrolling guard, Ezio asked the mercenaries where Leonardo's machine was hidden. One instructed Ezio to free them, so they would be able to show him the hidden entrance they had discovered. The Assassin obliged, however, they were ambushed twice by a large number of Borgia soldiers. Despite this, Ezio and the mercenaries eventually overpowered them and proceeded. Once led to the entrance to a network of underground tunnels, one of the mercenaries commented that Cesare intended to issue a surprise assault on Sicily with the tanks. Ezio then assured him that they, together, would prevent it. Traveling through the deep passages, Ezio opened several gates for the mercenaries, and rebuked them for any unhelpful comments, until they reached the cavern where a working tank was stored.

Tanks Battle
Ezio and his new allies took control of the tank, and staged a direct assault against the main weapons factory. Easily plowing through the countryside with the powerful weapon, they fired upon any mounted cannons, foot soldiers or other tank prototypes that blocked their path.

Blowing the gates of the main factory open and entering the courtyard, they discovered several damaged siege towers, and cannons in the process of being repaired, as well as several working or half-built tanks. After destroying the other war machines and siege weapons within the fortress walls, the mercenaries took their leave, and Ezio climbed up onto the walls of the factory. There, he expressed his wish to keep the tank, but nonetheless fired a mounted cannon at it, causing it to explode.

Trivia

 * While using the Tank, agile guards can be seen using guns.