The Final German Offensive
The Germans used about 20 tanks in their offensive, many of them captured British models. Most were quickly knocked out by French artillery.
July 15 1918, Dormans--The long-delayed German offensive against Rheims finally began shortly after midnight on July 15. The Germans knew that surprise would be key, but the long preparation time, the short summer nights, and deserters from an army tired of repeated offensives meant that the French had a decent idea of where the attack was to fall. The Germans would strike on both sides of Rheims--striking across the Marne in the west and in Champagne in the east, hoping to cut off the city. Its capture would greatly improve German logistics, would demoralize the French, and would hopefully draw off large numbers of reserves from Flanders, where Ludendorff wanted to strike next.
The Allies, aware the strike was coming, even down to the hour, launched their own preemptive barrage before the Germans did. Many of the German gas attacks were ineffective due to the wind. In Champagne, the French had learned well the lessons of the last few months, and kept only a token force near the front line. The German bombardment thus missed the main French positions to the rear, and the Germans infantry took heavy casualties advancing over open ground. By 11AM, the Germans realized their predicament, and halted their advance after failed costly attacks on the main French line.
To the west, the Germans had more success. The French had hoped the Marne would serve as an effective natural barrier, but they were able to cross the river at night with relative ease, and the French and Italian defenders in the area bore the brunt of the German bombardment. The Germans advanced four miles across the river, but the Allies had kept adequate reserves in the area to contain them. Among these were elements of the US 3rd Division, which held its position and even counterattacked against a German force that outnumbered them three-to-one. To this day, the 3rd Division (and especially its 38th Infantry Regiment) is nicknamed the “Rock of the Marne.”
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Sources include: Randal Gray, Chronicle of the First World War; Robert B. Asprey, The German High Command at War; David Stevenson, With Our Backs to the Wall.