For Lieutenant Colonel Philip R. Tarr, there was a mission at hand. Enemy Equipment Intelligence Service Team Number One, which he served on, needed information that only Dr. Otto Ambros had. Specifically, the team needed blueprints for equipment necessary for producing tabun nerve gas. When Tarr and Ambros arrived in Heidelberg, the U.S. Chemical Warfare Service had another IG Farben chemist in custody whom they wanted Ambros to work with on a classified job. The man is referred to in documents only as Herr Stumpfi. Ambros and Stumpfi were told to drive to a special metals firm located in
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