How did Dwight Eisenhower change World War 2?

Dwight Eisenhower - Dwight was a US Army general who held the position of supreme allied commander in Europe. He was best known for the D-day landings in Normandy. Code named operation overlord, this operation was a campaign to liberate Western Europe after the Axis forces (Germany, Japan, Italy, etc....) had captured most of Europe for 4 years. The landings were a success, but if the Germans had prevented the landings, they could have fought for up to another year!