Iceland in World War II: Strategic Ally, Reluctant Host

Iceland played a pivotal, if involuntary, role in the Battle of the Atlantic.

Timeline & Actions

• Pre-War: Neutral, sovereign kingdom in personal union with Denmark.
• Apr 1940: Denmark falls to Germany; Iceland assumes full independence.
• May 1940: British invade (Operation Fork) to prevent German occupation. No resistance; Iceland protests but cooperates.
• Jul 1941: U.S. Marines relieve British (by agreement with Icelandic gov't); up to 40,000 U.S. troops stationed.
• 1944: Iceland becomes republic (Jun 17); U.S. forces remain until 1946.

Contributions to Allied Victory

• Air Bases: Reykjavík (RAF/RCAF/USAAF) & Keflavík (Meeks Field) — critical for anti-submarine patrols, convoy escort, ferry route (USA→UK).
• Naval Anchorage: Hvalfjörður fjord — safe haven for convoy escorts, repairs.
• Intelligence: HF/DF (Huff-Duff) stations pinpointed U-boats; weather reporting vital for Atlantic forecasting.
• Rescue & Logistics: Saved hundreds of downed aircrews & torpedoed sailors.

Domestic Impact

• Economic boom: jobs, infrastructure (roads, hospitals, Keflavík airport), currency stability.
• Social friction: "Ástandið" (The Situation) — tensions over troop behavior, relationships, cultural change.
• Post-war: U.S. base stayed (NATO 1951); shaped Iceland's defense policy (no military, relies on allies).

Iceland's geography made it a linchpin; its people managed a complex occupation with pragmatism.