In the spring of 1918, the division began its movement toward embarkation camps. The division's advance detachment left Hoboken on 2 May and arrived at Brest, France, 10 May 1918. Late in June the last units of the Twenty-Seventh Division had arrived safely overseas. Until 24 July the division was in the final stages of training under British mentors, in Picardy and Flanders. On 25 July, the 27th Division less its artillery brigade and 102nd Ammunition Trains, occupied the Dickebusch Lake and Scherpenberg sectors in Flanders. In just over a month, this operation merged into the Ypres-Lys action, and then, from 19 August to 3 September, the 27th was on its own. The great Somme "push," lasting from 24 September to 1 October, saw the 27th (under command of the Australian Corps with the 30th US Division) engaged in severe fighting along the Saint Quentin Canal Tunnel—one of the out-lying strong points of the supposedly impregnable Hindenburg Line. Following heavy losses, the 27th was placed into reserve for rest and replacements at the conclusion of the first phase of the Somme Push. Six days later the Twenty-Seventh Division was back into action again, moving steadily toward Busigny on the heels of the retiring Germans. Operations until 9 October were supported by Australian Artillery then by British artillery units. The 27th Division had, in conjunction with British and Australian forces and the 30th Division, American Expeditionary Force, cracking the Hindenburg line wide open. The 52d Field Artillery Brigade and the 102nd Ammunition Train of the New York Division had not gone with the rest of the Twenty-seventh Division to the British front in Flanders. They had moved up on 28 October, to support the Seventy-Ninth Division in the Argonne. Meanwhile, the Twenty-Seventh Division units which had seen heavy action in Flanders, had moved back to an area near the French seaport of Brest. The 27th did break the Hindenburg line during the Battle of the Somme and forced a German retreat from their defensive line and forced the Germans to a final confrontation. After a final confrontation with the retreating Germans at the Selle River the Armistice ended the fighting and the division was sent home in February 1919, to be mustered out several months later. The first stateside division to be deployed in response to the attack on Pearl Harbor, the 27th Division departed Fort McClellan 14 December 1941 for California to establish blocking positions against an anticipated seaborne invasion of the United States southwestern coast.