In 1938, as part the Nazis' pursuit of the Holy Grail, the trooper and his comrades accompanied Walter Donovan, Elsa Schneider and Captain Helmut to the Canyon of the Crescent Moon with a group of Hatay soldiers following Indiana Jones' attempt to rescue his father Hnery Jones, Sr and Marcus Brody from Colonel Vogel's Mark VII Tank.
At the Grail Temple, the soldier was present when Donovan began sending men into the traps protecting the Grail to gain access to the artifact. When Indiana Jones and his friends appeared on scene, however, the trooper and his comrades witnessed Donovan shoot Henry Jones Sr. in order to force Indiana into braving the temple's dangers.
After Donovan was killed following his encounter with the Grail Knight, the trooper and his comrades witnessed the Grail's healing of the elder Jones' wounds. Schneider ended up losing her life when she tried to leave the temple with the Grail, triggering its collapse, but the trooper and a number of his comrades along with Helmut managed to escape the same fate.