By May 1918 the division had arrived in Europe, and began training with the British. On 14 July, ahead of an expected German offensive, the division was moving forward, with most of it committed to the second line of defence south of the Marne River and east of Château-Thierry. As the division took up defensive positions, the Germans commenced their attack, which became the Battle of Chateau-Thierry, with a fierce artillery bombardment. When the German assault collided with the main force of the 28th, the fighting became bitter hand-to-hand combat. The 28th repelled the German forces and decisively defeated their enemy. However, four isolated companies of the 109th and 110th Infantry stationed on the first defensive line suffered heavy losses. After the battle, General John Pershing, commander of the American Expeditionary Force, visited the battlefield and declared that the 28th soldiers were "Men of Iron" and named the 28th ID as his "Iron Division." The 28th developed a red keystone-shaped shoulder patch, officially adopted on 27 October 1918.