Eisenhower during his period as Supreme Commander Allied Expeditionary Force in command of the Allied forces in north west Europe.
They were together a great deal until the war ended, when Eisenhower cut ties and returned to the United States.
It is generally agreed that Summersby and Eisenhower became extremely close during the war, and some writers have suggested that they had a sexual relationship, although people who knew both of them at the time have rejected that claim, as have most of Eisenhower's biographers.