He served in Finland during the Winter War and back in Sweden he became commanding officer of the Jämtland Ranger Regiment.

Agell headed the Swedish Delegation to the Neutral Nations Supervisory Commission and became the civil defence chief in Norrköping before retiring in 1958.

Agell was born on 29 August 1894 in Hjo, Sweden, the son of Nils Andersson, a mill and saw owner, and his wife Blenda (née Samuelson).

[1] He was acting head of the Royal Military Academy in 1937 and became a lieutenant colonel in the Finnish Army as part of the Swedish Volunteer Corps during the Winter War in 1940.

[1] Agell was appointed commander of the Norrköping-Linköping Defence District (Norrköping-Lindköpings försvarsområde) in 1949[1] and was the head of the Swedish Delegation to the Neutral Nations Supervisory Commission from 1 May 1954 to 31 November 1955,[3] with a temporary rank of major general.