The U.S. Army's WWI Campaigns commemorative series has some excellent modern-looking, yet very informative maps of the AEF's battlefields. I found this one covering the activities of the 27th and 30th Divisions just south of Ypres in the late summer of 1918, in SUPPORTING ALLIED OFFENSIVES: 8 AUGUST–11 NOVEMBER 1918 written by two friends from the Western Front Association;s US-East Coast Chapter, Paul Cora and Alexander Falbo-Wild. The entire volume can be downloaded HERE.
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After this operations the two division would be merged into the U.S II Corps and detailed to the British Fourth Army for the assault on the Hindenburg Line.