Notably, he commanded the third Swedish battalion in Cyprus as part of the UN Peacekeeping Force and later served as a military attaché in Washington, D.C., and Ottawa.
Promoted to major general in 1972, he held significant roles in the Swedish Defence Materiel Administration before entering the reserves in 1982.
Ståhl's international service continued as he commanded the United Nations Disengagement Observer Force in Damascus from 1982 to 1985, achieving notable success in facilitating a prisoner exchange between Syria and Israel.
He attended the same class as the future Chief of the Army Staff, Major General Gösta Hökmark.
[5] Ståhl graduated in 1942 and was commissioned as an officer the same year and was assigned as a second lieutenant into the Swedish Engineer Troops.
[10] After that, he served as a military attaché at the embassies in Washington, D.C., and Ottawa from 1966 to 1972[11][12] and attended the Senior Staff Course at the Swedish National Defence College in 1972.
[6] On 5 May 1982, Ståhl was appointed commander of the United Nations Disengagement Observer Force (UNDOF), with headquarters in Damascus, with effect from 1 June 1982, replacing Major General Erkki R. Kaira of Finland.
[4] In 1990, Ståhl and Bishop Emeritus Olle Nivenius [sv] each received SKS's cultural prize.