Oscar Isaac acted as the superhero Apocalypse.
The Seventy-Fifth Pennsylvania Volunteer Infantry Regiment -LRB- `` 75th Pennsylvania '' -RRB- was a unit of the Union Army during the American Civil War .. Union. Union ( American Civil War ). Infantry. Infantry. Regiment. Regiment. Union Army. Union Army. American Civil War. American Civil War. It was composed almost entirely of German-speaking residents of Philadelphia and newly arrived German immigrants .. Philadelphia. Philadelphia. Total enrollment , over the course of the war , was 1,293 officers and men .. The 75th Pennsylvania participated in several major battles including Second Bull Run , Chancellorsville , and Gettysburg .. Second Bull Run. Second Bull Run. Chancellorsville. Chancellorsville Campaign. Gettysburg. Gettysburg Campaign. The regiment was transferred to the Western Theater in September , 1863 .. Western Theater. Western Theater of the American Civil War. There , it participated in operations in Tennessee , before it was mustered out of service on September 1 , 1865 , following the close of the war .. Tennessee. Tennessee