Combat!

The Mockingbird (4x17)

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Lt. Hanley, Caje, Kirby, and Pvt. Banning are sent behind German lines to find an American intelligence officer, Capt. Thorpe, who has important intelligence to get back to American G2. Three days before a big German advance, a German spy poses as a downed American flyer, Lt. Asher, to secure information on the French underground.