Skip to Main Content


Written by: Edward G. Lengel, The National World War II Museum

By the end of this section, you will:

  • Explain the causes and effects of the victory of the United States and its allies over the Axis Powers

Suggested Sequencing

Use this narrative with the Dwight Eisenhower, D-Day Statement, 1944 Primary Source to give students a fuller understanding of the campaign. This narrative can also be used with the Raising the Flag on Iwo Jima Narrative and the Phil “Bo” Perabo, Letter Home, 1945 Primary Source to showcase American soldiers’ experiences during WWII.

Allied leaders had debated opening a second front in German-occupied western Europe as early as 1942. Soviet Premier Joseph Stalin’s pressure to launch such a front was unrelenting and reiterated at every Allied conference. Developing the means to launch a successful invasion was far from easy, however. Until 1944, the United States and Great Britain lacked the forces and the means to attack the Germans in France and successfully open a beachhead to invade Normandy. And success was all important. If a large-scale invasion failed, the results would be disastrous, and not just in terms of troops lost. Assembling another invasion might take years.

By the spring of 1944, however, the outlines of what came to be called Operation Overlord were complete. Five divisions of American, Canadian, and British troops, supported by three airborne divisions of paratroopers and glider-borne soldiers, were to land on beachheads in Normandy. After securing the landing beaches, establishing a firm perimeter, capturing the port of Cherbourg, establishing portable harbors there for resupply, and assembling armored reinforcements, Allied forces could drive inland to begin the liberation of France.

Several moving pieces had to be put in place before the plan could get underway. First, adequate naval support, and especially transport and landing craft, had to be secured – an especially difficult undertaking given the demands of warfare in both Europe and the far-flung Pacific, where amphibious landings on the Japanese-held islands were frequent. Second, American and British air forces had to work in complete coordination with ground forces, not only placing paratroopers and glider-borne forces on target but also preventing German efforts to move reinforcements and especially panzer divisions toward the beaches. Third, Free French forces, some owing allegiance to General Charles De Gaulle and others not, had to be alerted to the invasion and their support coordinated. Finally, an elaborate campaign of deception was established to convince the Germans that the primary Allied invasion would take place not in Normandy but at the heavily defended and more centrally located Pas de Calais, at the narrowest point of the English Channel.

Coordinating these factors, many under the control of disparate personalities who had different ideas about how the invasion should take place, took months. The Allied Supreme Commander General Dwight D. Eisenhower, working with British General Bernard Law Montgomery (in command of the invading ground forces) and British commanders of the supporting naval and air forces, finally thought he had his pieces assembled at the beginning of June, but there was one final decision to be made. Because of the tides and other factors, the Allies could land at the beaches of Normandy only on certain dates, but weather reports suggested unsettled weather in early June. In a tense meeting at his headquarters in Bletchley Park, England, Eisenhower elected to gamble on a break in the weather and said “Go” for the invasion on June 6, 1944.

At this critical moment, Eisenhower’s leadership abilities came to the fore. Rather than remaining at headquarters, he made a point of visiting, encouraging, and even joking with the troops assembled to carry out the invasion. He dispatched a message to them declaring, “You are about to embark upon a great crusade, toward which we have striven these many months. The eyes of the world are upon you. . . . I have full confidence in your devotion to duty and skill in battle. We will accept nothing less than full Victory. Good luck! And let us all beseech the blessing of Almighty God upon this great and noble undertaking.” But the general also penned a draft dispatch to be sent in case the invasion failed, taking full responsibility upon himself.

General Dwight D. Eisenhower, in uniform, addresses a group of soldiers that surround him. Many of the soldiers wear camouflage paint on their faces.General Dwight D. Eisenhower gave his order of the day, “Full victory – nothing else!” to paratroopers before the first assault in the Allies’ 1944 invasion of Europe.

American and British airborne troops carried out the first phase of the invasion by landing around the coastal villages behind German beach defenses on the night of June 5-6. Although badly scattered and forced to work in small, poorly armed groups, they succeeded in their primary mission of seizing – and, where necessary, destroying – important bridges and crossroads to hold back enemy reinforcements. U.S. Army Rangers carried out a heroic and costly assault against German cliffside emplacements at Pointe du Hoc overlooking Omaha Beach, only to discover that the enemy had already dismantled their heavy guns.

The primary invasion took place on five Normandy beaches, code-named (from west to east) Utah, Omaha, Gold, Juno, and Sword. British and Canadian troops landed at the latter three beaches against weaker-than-expected enemy opposition and quickly seized their immediate objectives. At Utah, thanks in part to airborne support inland, the U.S. 4th Division landed successfully and laid the groundwork for the capture of the Cotentin Peninsula and the all-important port of Cherbourg.

The map shows the routes of naval bombers on D-Day. The Western Task force is American and the Eastern Task force is British.The D-Day invasion took place on five Normandy beaches, code-named (from west to east) Utah, Omaha, Gold, Juno, and Sword. The landing at Omaha Beach by U.S. troops proved the most difficult.

At Omaha Beach, however, facing strong tides and mistakes by inexperienced infantry and naval forces, the invasion nearly foundered. Here, troops of the U.S. 29th and 1st Divisions (the famous “Big Red One”) faced a strong defense from well dug-in and determined German infantry that they struggled to overcome. Heavy casualties on the beaches led General Omar Bradley, commanding the U.S. First Army, briefly to consider abandoning the beachhead. But the infantry refused to give up and, with great courage and sacrifice, they finally managed to break the German defenses and establish a defensive perimeter. Fortunately, Allied ground attack aircraft also succeeded in their primary missions of supporting airborne troops inland and inflicting heavy casualties on German armored and infantry forces as they rushed toward the beaches.

Photograph shows a beach full of Czech hedgehogs. Soldiers and tanks are on the beach. Large ships are in the sea just past the hedgehogs.American soldiers come ashore at Omaha Beach on D-Day, June 6, 1944, near Colleville-sur-Mer in Normandy, France.

Although casualties had been heavy at places like Omaha Beach, overall Allied losses for June 6 totaled 4,900 killed, wounded, and missing – far lower than Eisenhower and his generals had anticipated. The five Allied beachheads were linked together by June 12, and by the end of the month, Cherbourg had been captured. Firmly entrenched and supplied, thanks in part to elaborate and expensive portable harbors codenamed Mulberry that were established on the Normandy beaches (although one was destroyed by a storm on June 19), the Allies had succeeded in forming the long-awaited second front. Although the drive inland proved far more difficult than anticipated, the process of the liberation of Western Europe had begun.

Trucks of soldiers sit on shore. Going out from the shore into the sea is a Mulberry harbor with cargo being transported on top.

One of the Mulberry harbors established on the D-Day beaches in 1944, which allowed the Allies to secure supplies to liberate France.

Review Questions


In the background, ships fill the sea and blimps fill the air. In the foreground, many landing ships sit on a narrow beach. The mainland shore is full of trucks and soldiers.Normandy, June 1944.
Refer to the image provided.

The outcome of the events depicted in the photograph resulted in

  1. the liberation of Western Europe
  2. the fall of Japan
  3. the creation of the League of Nations
  4. the presidential election of Herbert Hoover

2. The Allied leader overseeing D-Day was

  1. Erwin Rommel
  2. Dwight Eisenhower
  3. George Marshall
  4. Bernard Law Montgomery

3. One of the key concerns in Allied planning for Operation Overlord was

  1. securing the support of the Soviet Union
  2. amassing enough naval support to transport and land troops and equipment
  3. getting the help of the French resistance
  4. getting the approval of Harry Truman

4. The D-Day invasion marked the

  1. beginning of the development of an atomic bomb
  2. fall of Benito Mussolini’s Italy
  3. surrender of Adolf Hitler to Allied troops
  4. opening of a second front against Nazi Germany

5. The Normandy invasion in World War II was considered necessary to

  1. stop the spread of Japanese imperialism
  2. relieve the pressure on the eastern front
  3. save Italy from falling to Nazi Germany
  4. keep the Nazis from developing a nuclear bomb

6. The night before the D-Day landings American and British troops successfully

  1. surprised and destroyed German army headquarters
  2. dismantled the bulk of Nazi shore defenses
  3. captured vital bridges and crossroads
  4. captured Adolf Hitler

Free Response Questions

  1. Explain the need for the D-Day invasion in World War II.
  2. Explain the Allies’ challenges in planning the D-Day invasion in World War II.

AP Practice Questions

“SUPREME HEADQUARTERS ALLIED EXPEDITIONARY FORCE Soldiers, Sailors, and Airmen of the Allied Expeditionary Force! You are about to embark upon the Great Crusade, toward which we have striven these many months. The eyes of the world are upon you. The hope and prayers of liberty-loving people everywhere march with you. In company with our brave Allies and brothers-in-arms on other Fronts, you will bring about the destruction of the German war machine, the elimination of Nazi tyranny over the oppressed peoples of Europe, and security for ourselves in a free world. Your task will not be an easy one. Your enemy is well trained, well equipped and battle-hardened. He will fight savagely.”

General Dwight D. Eisenhower, Order of the Day, 1944

Refer to the excerpt provided.

1. The sentiments expressed in Eisenhower’s “Order of the Day” most directly led to

  1. the collapse of fascist regimes in Europe
  2. the fall of communism in Eastern Europe
  3. the dropping of the atomic bomb
  4. the beginning of the Cold War

2. The situation referred to in the excerpt from Eisenhower’s Order of the Day was directly shaped by

  1. the establishment of a fully integrated American military
  2. the success of the Treaty of Versailles
  3. the defeat of Nazi tyranny by the free nations of the world
  4. the success of the island-hopping campaign in the Pacific Theater of Operation during World War II

3. The sentiments in the excerpt were most directly shaped by

  1. the Monroe Doctrine
  2. technological advances in military armaments
  3. rejection of the collective-security provision in the League of Nations covenant
  4. the belief that the war was a fight for the survival of democracy

Primary Sources

Baumgarten, Harold. D-Day Survivor: An Autobiography. New York: Pelican, 2006.

Santoro, G. “Omaha the Hard Way: Conversation With Hal Baumgarten.”

Suggested Resources

Ambrose, Stephen E. D-Day June 6, 1944: The Climactic Battle of World War II. New York: Simon and Schuster, 1994.

Atkinson, Rick. The Guns at Last Light: The War in Western Europe, 1944–1945. New York: Henry Holt, 2013.

Beevor, Antony. D-Day: The Battle for Normandy. New York: Viking, 2009.

Caddick-Adams, Peter. Sand and Steel: The D-Day Invasion and the Liberation of France. Oxford, UK: Oxford University Press, 2019.

Chambers, John Whiteclay, ed. The Oxford Companion to American Military History. Oxford, UK: Oxford University Press, 1999.

D’Este, Carlo. Decision in Normandy. New York: Harper, 1994.

Hastings, Max. Overlord: D-Day and the Battle for Normandy. New York: Simon and Schuster, 1984.

Holland, James. Normandy ’44: D-Day and the Epic 77-Day Battle for France. New York: Atlantic Monthly Press, 2019.

Keegan, John. Six Armies in Normandy: From D-Day to the Liberation of Paris. New York: Viking, 1983.

Kershaw, Alex. The Bedford Boys: One American Town’s Ultimate D-Day Sacrifice. New York: Da Capo Press, 2003.

Kershaw, Alex. The First Wave: The D-Day Warriors Who Led the Way to Victory in World War II. New York: Dutton Caliber, 2019.

McManus, John C. The Dead and Those About to Die: D-Day: The Big Red One at Omaha Beach. New York: Dutton Caliber, 2014.

Ryan, Cornelius. The Longest Day: June 6, 1944. Reprint. New York: Simon & Schuster, 1994

Weinberg, Gerhard L. A World at Arms: A Global History of World War II. Cambridge, UK: Cambridge University Press, 1994.

Related Content