Peter Thorn enlisted and was assigned to the Union's 138th Pennsylvania Infantry and Elizabeth took on the duties of her husband as the caretaker during his service. The war came to Gettysburg and Evergreen Cemetery in 1863. As the armies maneuvered in preparation for one of the pivotal battles of the war, Elizabeth and her family were ordered to leave their home for safety. Once the fighting moved away from the area, the Thorn family returned to their home and found it almost completely destroyed with most of their possessions stolen while their livestock had been taken or slaughtered.
Discovering wounded soldiers in her home when her family returned, Elizabeth did her best to care for them with the little food and supplies that had not been taken or destroyed. Once the soldiers left the Thorn home, Elizabeth was ordered by the military to start burying the soldiers who perished near her home. Elizabeth was six months pregnant at the time but still hand-dug graves and buried 91 soldiers and 14 civilians.
Peter Thorn returned home in 1865 and the couple lived together they died only months apart in 1907. Both Elizabeth and Peter are buried at Evergreen Cemetery.