US Navy Operation Neptune 1944-06-06 Coast of Normandy She received orders to New York to embark troops for service in Europe. On 11 February the ship departed New York with a convoy bound for the British Isles and arrived at Glasgow, Scotland on 22 February. From there she moved south to the Isle of Portland, England to await orders. On 11 March Bayfield made the short run to Plymouth and joined a group of amphibious ships that then set course for western Scotland. The ships reached the River Clyde on 14 March and carried out landing exercises there through 21 March in preparation for the European invasion at Normandy.
On 29 March she bore the flag of Commander, Force "U" (Rear Admiral Don Pardee Moon) and served as headquarters for planning the landings on "Utah Beach." She joined with other Normandy-bound ships in practicing a variety of maneuvers and tactical operations during short underway periods until 26 April, when full-scale rehearsals took place through 4 May. Bayfield anchored again at Plymouth on 29 April and on 7 May began embarking troops of the 8th Infantry Regiment (U.S. 4th Infantry Division) and the 87th Chemical Battalion.
By 5 June the invasion force completed all preparations and got underway for the Bay of the Seine. Passing along a swept channel marked by lighted buoys, Bayfield, and the other transports reached their designated positions early on the morning of the 6 June and debarked their troops. After disembarking her troops, Bayfield began service as a supply and hospital ship in addition to continuing her duties as a flagship. Those assignments kept her off the Norman coast while other transports rapidly unloaded troops and cargo and then returned to England. On the 7 June, she shifted to an anchorage five miles off the beach and made smoke that night to protect Utah anchorage from Luftwaffe attacks.