The year before, Soviet leader Joseph Stalin had repeatedly asked British Prime Minister Winston Churchill and American President Franklin Delano Roosevelt to open a second front on the Atlantic Coast of Europe, to provide his army on the east with relief.
General Dwight D. Eisenhower, the supreme allied commander in Europe, planned and carried out the liberation of Western Europe and invasion of Germany, code-named Operation Overlord. This large-scale invasion required hundreds of thousands of troops to be assembled and trained for amphibious landing. The plans had to account for beach attacks and required information on the terrain and weather tracking.
Before the invasion began, Eisenhower sent a message of encouragement and support to the troops. He compared the invasion with a "crusade" and noted that their goal was nothing less than "security for ourselves in a free world." He expressed "confidence in your courage and devotion to duty and skill in battle," while noting, "We will accept nothing less than full victory."
He ended with a request for assistance from "God Almighty upon this great and noble undertaking."
The invasion began on June 6, 1944. It included nearly 3 million soldiers, sailors, airmen and marines, some 11,000 planes and nearly 7,000 vessels carrying close to 200,000 tanks and other vehicles.
That night, Roosevelt broadcast his prayer. Biographer Jon Meacham noted, "the White House had distributed the text beforehand so that the audience -- an estimated 100 million Americans -- could recite the words with Roosevelt."
"My fellow Americans: Last night, when I spoke with you about the fall of Rome, I knew at that moment that troops of the United States and our allies were crossing the Channel in another and greater operation. It has come to pass with success thus far. And so, in this poignant hour, I ask you to join with me in prayer."
Imagine 100 million Americans reciting the words of this prayer with their president.
"Almighty God: Our sons, pride of our Nation, this day have set upon a mighty endeavor, a struggle to preserve our Republic, our religion and our civilization, and to set free a suffering humanity.
"Lead them straight and true; give strength to their arms, stoutness to their hearts, steadfastness in their faith. ...
"They will be sore tried, by night and by day, without rest -- until the victory is won. The darkness will be rent by noise and flame. Men's souls will be shaken with the violences of war.