On September 11, 1944, a reconnaissance squadron of the US 5th Armored Division "Victory Division" was the first allied force to enter Nazi-Germany. An excerpt from the article:
"The “Victory” Division went into combat in August 1944. For the first time in the history of armored warfare a full armored division was to be sent driving through enemy territory in a spectacular 300-mile mission to disrupt and trap enemy forces. Fifteen days after the first 5th Armored tanks had rolled through the gap between Coutances and St.Lô, they had reached Argentan.
From here the 5th Armored turned east to cut off German units west of the Seine. Paris lay only 50 miles away, but the 5th swung north toward the junction of the Eure and Seine Rivers. In this natural pocket the Division trapped thousands of Nazis vainly attempting to cross the Seine and escape.
Paris liberated, the Victory Division started a fast drive to the Belgian border, 130 miles north. It cut through Compiègne Forest, crossed the Oise and Aisne Rivers, and then the Somme. A month later the Division was at Condé on the Belgian border.
New orders sent the outfit racing another 100 miles to the Meuse River. Speeding onward, the 5th Armored spearheaded the drive that liberated Luxembourg. On September 11, 1944, elements of the Victory Division crossed the Our River into Germany, and thus earned the distinction of being among the first Americans to fight on German soil."