Indiana Jones and Remy Baudouin receive a promotion to lieutenant in the Belgian Army and are sent to Africa in November 1916. After taking the wrong train, they join the 25th Royal Fusiliers, a unit of older men led by Indy's acquaintance Frederick Selous. The unit is on a mission to find and destroy a German Phantom Train carrying a massive artillery gun, where Indy's knowledge of trains and German language prove useful.
The Adventures of Young Indiana Jones: The Phantom Train of Doom
Indiana Jones and Remy Baudouin trade the European trenches for the African savannah in November 1916, earning lieutenant promotions in the Belgian Army upon their arrival.