An integrated military structure for NATO was first established after the Korean War raised questions over the strength of Europe's defences against a Soviet attack. The first choice for commander in Europe was American General of the Army Dwight D. Eisenhower, as he had successfully directed the Allied landings in Normandy and subsequent march into Germany during World War II, amid many inter-Allied controversies over the proper conduct of the campaign on the Western Front. On December 19, 1950, the North Atlantic Council announced the appointment of General Eisenhower as the first SACEUR. British Field Marshal Sir Bernard L. Montgomery moved over from the predecessor Western Union Defence Organization (WUDO) to become the first Deputy SACEUR, who would serve until 1958. Volume 3 of Nigel Hamilton's "Life of Montgomery of Alamein" gives a good account of Montgomery's exacting, tireless approach to improving the command's readiness, which caused a good deal of bruised feelings in doing so. In establishing the command, the first NATO planners drew extensively on WUDO plans and personnel.