During the year 1918 the Germans made tremendous efforts to carry this position, the loss of which would have meant the fall of Rheims, leaving Epernay and Châlons-sur-Marne unprotected.
Although held to the east of Mountain, they obtained important successes on the west, where they reached the Marne, while in May they occupied the Woods of Courton and Le Roi. In July they crossed the Marne and advanced as far as Montvoisin, on the road to Epernay. Very fierce fighting took place, especially to the north-west of the Mountain at Bouilly, Bligny, St. Euphraise and Vrigny. These positions, and Hill 240 to the west of Vrigny, were several times lost and recaptured by the Allied troops under General Berthelot, French, Italian and British, who fought there side by side.
Vrigny was taken by the Germans on May 30, but retaken by the Allies on June 1 at the point of the bayonet. The same evening, four German regiments, after progressing slightly in the direction of Hill 240, were first checked, then driven back after bitter hand-to-hand fighting.
On June 9, the Germans were repulsed around Vrigny, after having sustained severe losses. On the 23rd, they rushed Bligny Hill, held by Italian troops, reaching the summit, but were shortly afterwards driven back. On the 29th, they sustained a like check at the same place.
In July they advanced their lines slightly towards Marfaux, Pourcy and Cuchery, but were unable to hold the captured ground. On the 18th, the Italians advanced in the region of Bouilly. On the 19th, Franco-British troops progressed towards St. Euphraise. On the 21st, the Allies carried Bouilly and St. Euphraise. On the 24th and 25th, in spite of desperate repeated efforts, the Germans were unable to hold Hill 240 which they had temporarily captured. On August 1 further enemy efforts to carry the Bligny uplands failed.
The region of Gueux—Thillois—Champigny was terribly ravaged by the war.
On September 11th, 1914, the French 5th Division, under General Mangin, drove the enemy from these positions, which remained in the French lines until May 30, 1918. Occupied by the Germans on May 31, after fierce fighting, they were completely devastated by artillery fire. Retaken by the French, then lost again in July, Thillois was finally recaptured on August 2, at the same time as Gueux.
On August 4, after having reached the Vesle at several points east of Fismes, French troops engaged a vigorous battle between Muizon and Champigny, and some of them succeeded in crossing the river the same day.