The destroyer underwent post-shakedown alterations and repairs at the Boston Naval Shipyard, and cleared the harbor 15 May for a schedule of local operations off New England. On 27 June "Barry" departed for Rosslare, Ireland, and her first deployment to Europe. She visited St. Nazaire, France, and Lisbon, Portugal, before arriving at Gibraltar on the morning of 16 July. Assigned to the 6th Fleet, the destroyer escorted carriers, operated as plane guard, and conducted ASW barrier patrols before returning to Newport, Rhode Island, in August.