His father was Lieutenant General Hjalmar Siilasvuo of Winter War fame.

Ensio Siilasvuo enlisted in the Finnish Army in 1940 and served as a chief-of-staff of an infantry regiment in 1945.

He was Commander of the United Nations Emergency Force II on the Sinai Peninsula from the end of the October War (1973) until August 1975.

In August 1975 he was assigned to the new post of Chief Coordinator of the United Nations Peacekeeping Missions in the Middle East, which he held until peace was reached between Egypt and Israel in 1979.

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