Ulrika Eleonora Stålhammar finally enlisted in the army as an artillerist in Kalmar on 15 October 1715 under the name of Vilhelm Edstedt. She did not participate in active warfare, as she was posted in the garrison of Kalmar, which did not see any action during the Great Northern War. Nevertheless, she was successful in her professional conduct and was eventually promoted to the rank of corporal. Reportedly, she preferred to rent a room rather than to sleep in the barracks. This was permitted and acceptable, though somewhat unusual among common soldiers, who normally preferred not to spend their meager salary on special sleeping arrangements.