Morris then begins his combat training with his new partner Agent Dexter , another MIA from history who is implied to have gone missing on 9/11 . As he is from the 1800s , he requires a crash course in " modern " weaponry ( ranging from World War I to the late 22nd century ) . Upon completion of his training Mother tasks Morris and Dexter with tracking down two individuals who are not where they are supposed to be : one Corporal Welsh from the Union Army in the American Civil War at the Battle of Antietam , and a Russian Army Officer named Petrovich in World War I at the Battle of Tannenberg
9/11
September 11 attacks
Darkest of Days