Old Indy voluntarily visits a psychiatrist to prove he's still able to take care of himself (after getting himself stuck up a tree trying to rescue a cat). While there, he recounts a meeting with Sigmund Freud, Carl Jung and Alfred Adler in Vienna, Austria in 1908. The three of them were there to attend the world's first psycho-analytical conference. Young Indy asked them how to cope with his first crush, on Princess Sophie of Austia, daughter of Archduke Franz Ferdinand. 

November, 1916. Indiana Jones and Remy Baudouin have managed to get a transfer from the European trenches to the plains of Africa. On arrival they both receive a promotion to the rank of lieutenant in the Belgian Army. When they take the wrong train they end up in Moshi. Desprerate to join their unit in Lake Victoria, the two men bump into the 25th Royal Fusiliers, a unit of cranky old men led by Indy's old acquaintance Frederick Selous. Indy's passing knowledge of trains and fluent German comes in handy for the Fusiliers, who are about to go on a mission to find and destroy a Phantom Train that carries an enormous German artillery gun. After accomplishing their goal, Selous tricks Indy and Remy into joining his unit for another caper involving the capture of the German military strategist Colonel Von Lettow-Vorbeck.