The Spy starts in his standard attire, which is useless. You need an officer's uniform. Unfortunately, officers are scarce in the early game. You must eliminate a standard soldier first to clear the path to an officer.
Sabotage the armored carriages located on the siding. commandos beyond the call of duty mission 4
For the main rail gun, place two explosive charges next to the artillery shells on either side of the weapon. The Spy starts in his standard attire, which is useless