sentences:  Remembering the national reaction after the Platoon were recently mistaken for enemy agents during a training exercise, Mainwaring decides to get his platoon to masquerade as fifth columnists in "very sinister clothes" to shake everyone up and become appreciated again, and to prevent a repeat of last time he informs the Colonel at GHQ of the plan, called "Operation Wake-Up".Taking pity on him, Mainwaring invites Hodges to join them which he gratefully accepts.He and his men (except Godfrey, who stays at the church hall to act as their contact man) meet up at their "secret base", although things get out of hand with disguises