Ruanda-Urundi was a colonial territory, once part of German East Africa, which was ruled by Belgium from 1916 to 1962. The region was occupied by troops from the Belgian Congo during the East African campaign in World War I and was administered by Belgium under military occupation from 1916 to 1922. It was subsequently awarded to Belgium as a Class-B Mandate under the League of Nations in 1922 and became a Trust Territory of the United Nations in the aftermath of World War II and the dissolution