Career
Ehrensvärd became an officers volunteer in the Svea Life Guards (I 1) on 24 May 1911. He became the Queen's Page of Honour in 25 August 1912 and a cadet at the Royal Military Academy on 25 October the same year. Ehrensvärd became a second lieutenant in the Svea Life Guards (I 1) in 1913 and became lieutenant there in 1915. He took part in the Invasion of Åland as adjutant of the commanding officer of Åland Detachment in 1918 and resigned from the Swedish Army the same year and joined the Finnish Army where he commanded the Archipelago Free Corps (Skärgårdens frikår) and took part in battles in Åboland archipelago and southwestern Finland (Korpogård 28 March, Lohm 4 April and Loimaa 22 April).
He was promoted to major in the Finnish Army in May 1918 and was then reinstated in the Swedish Army as lieutenant in the Svea Life Guards (I 1) in September the same year. Ehrensvärd then attended the Royal Swedish Army Staff College from 1920 to 1922 and was a cadet of the General Staff from 1923 to 1925. He was staff adjutant and was promoted to captain of the General Staff in 1926 and served in the Svea Life Guards (I 1) in 1927 and was a teacher at the Royal Swedish Army Staff College from 1928 to 1934. Ehrensvärd was captain in the Svea Life Guards (I 1) in 1931 and staff adjutant and captain of the General Staff in 1932. He was major and chief adjutant of the General Staff in 1934 and in 1935. He was head of the Central Department of the General Staff from 1935 to 1937 and the Army Operations Department in the Defence Staff from 1937 to 1938.
Ehrensvärd was major and chief adjutant in the General Staff Corps from April to July 1937 and was in October of that year promoted to lieutenant colonel and chief adjutant in the General Staff Corps. He was lieutenant colonel and commanding officer of the tank battalion at Göta Life Guards (I 2) from 1938 to 1939 and the tank battalion at Skaraborg Regiment (I 9) in 1939. Ehrensvärd was lieutenant colonel and Chief of Staff of the Swedish Volunteer Corps during the Winter War in Finland in 1940. There he took part in operations in Lapland during 1940. Ehrensvärd was promoted to colonel in the Finnish Army in 1940 and colonel in the Swedish Army the same year. He was head of the Royal Swedish Army Staff College from 1940 to 1941 and commanding officer of South Scanian Infantry Regiment (I 7) from 1941 to 1942. Ehrensvärd was section chief in the Defence Staff from 1942 to 1944 and was promoted to major general and appointed acting Chief of the Defence Staff in 1944. He was Chief of Defence Staff from 1945 to 1947. Ehrensvärd had the military responsibility for the Swedish stay-behind operation which was organised starting from 1946. He served as military commander of the I Military District from 1947 to 1948. Ehrensvärd was promoted to lieutenant general and was appointed Chief of the Army in 1948.
The year before, in 1947, a proposal to appoint pro-German Colonel Alf Meyerhöffer as army infantry inspector led to the so-called "Meyerhöffer affair" when the proposal met with great opposition from the Social Democratic government. A compromise made Meyerhöffer acting infantry inspector in 1947. Following threats of resignation from Ehrensvärd's cousin and Chief of the Army, Lieutenant General Archibald Douglas, Meyerhöffer was finally appointed cavalry and infantry inspector in 1949. The far more Western-friendly Ehrensvärd had been appointed Chief of the Army in 1948 which led Meyerhöffer into conflict with his new commanding officer and he therefore lodged his resignation in 1951. Ehrensvärd was intended to have become Supreme Commander but was rejected by Allan Vougt on the grounds that Ehrensvärd was better suited for war than peace.
In 1956, Ehrensvärd appointed Major Sigmund Ahnfelt as UN battalion commander in Gaza. The government opposed the nomination because of Ahnfeldt's previous involvement in the Lindholm movement. Ahnfeldt had been Sven Olov Lindholm's closest man for six years and had at the age of 27 candidated for the National League of Sweden after Meyerhöffer at the municipal elections in Östersund. Ehrensvärd threatened to resign unless he got his way, according to prime minister Tage Erlander. Ahnfeldt was persuaded by defence minister Torsten Nilsson to resign from the post. Ehrensvärd was Chief of the Army until 1957 when he was promoted to full general and transferred to the reserve.
In the early 1960s, the secret documents from Operation Stella Polaris in 1944, were brought from Hörningsholm Castle and Rottneros Manor and burnt on the instruction of the then Director-General of the National Defence Radio Establishment, Gustaf Tham, and the now retired General Ehrensvärd.
