Who was Allied Supreme Commander of the troops at D-Day​

General Dwight D Eisenhower

General Dwight D Eisenhower (1890-1969) was appointed Supreme Commander of the Allied Expeditionary Forces (SCAEF) for Operation 'Overlord' in late 1943 and headed SHAEF (Supreme Headquarters, Allied Expeditionary Force), which oversaw the entire liberation of Nazi-occupied north-west Europe.

Explanation:

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(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity