You will be instructed on how to call in rear echelon (RE) squads, make firing positions (FPs), lay tank traps (TTs) and so on. Derby): You’re at a US forward operating base in Belgium and have to move some troops to sentry duty a short distance from the base. Once you have played it successfully, you have the option to skip it in future campaigns. This is an “intro” mission cum tutorial meant for first-time Ardennes Assault players.