Impervious to bullets. The machines wrecked havoc  among the enemy. The battle was all but won...

but then.

A dragoon made it towards napoleon side.

Arnaud was ready, as that's how far he got.

At that time the Brits where about to surrender

Was it not for an unexpected bullet, hitting the steam engine

That caused everyone around to be caught in an explosion

It was the end of both friends.