D-Day for WWII was June 6, 1944 — the day on which the Battle of Normandy began — commencing the Western Allied effort to liberate mainland Europe from Nazi occupation during World War II. President Roosevelt composed a prayer and delivered it on the radio that evening. What follows is the full text of that address:

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:

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…