In Biggles Foreign Legionnaire, Liebnitz was the pilot in charge of the Douglas DC-3 belonging to the committee of the war-mongering syndicate which was used for carrying stores and fuel for the secret squadron. Towards the end of the story, Liebnitz flew Erich von Stalhein, Fabiano Pantenelli and Hugo Festwolder to the Valley of the Tartars and was killed along with the rest of them when the Kurds attacked the base.

The aircraft of the secret squadron were kept permanently short of fuel to prevent the pilots from deserting. That Liebnitz was entrusted with a long-range aircraft, and used for ferrying fuel, must indicate that he was one of the senior, trusted pilots like Voss, Leffers or Klein.

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