General Hospital No. 13 was considerably smaller than No. 11, but with the arrival of AEF forces, it meant for the first time they were often treating American casualties. First, a large influx of wounded from the 33rd American Division who had been at the Somme. And soon after, when the British began their final assault on the Montdidier area in early August 1918. From them until the end of the war, they saw a heavy succession of casualties from those of the 27th and 30th Infantry Divisions fighting at Kemmelberg and Messines Ridge on the Hindenburg Line with the British, and from the 37th and 91st serving with the French in Belgium. Even after the armistice was declared, sick and wounded continued to arrive from forward hospitals through November and December. Finally, at the beginning of February 1919, the hospital stopped taking patients.