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The French success enabled artillery-observers to direct their guns onto the Colmar–Mulhouse railway and local German attacks on 25 April took back the peak; the French recaptured it the next day but the 152e Régiment had 825 casualties. In December 1915, Dubail as commander of Groupe d'armées de l'Est (GAE: Eastern Army Group) planned a larger operation to consolidate the French position in the region by capturing Mulhouse. An attack on Hartmannswillerkopf by the 66e Division (General Marcel Serret [fr]), which had been fighting in the area all year was to be the prelude to the larger attack. The division was given 250 more guns for the attack, two of which were super-heavy 370 mm Filloux mortars, an average of one gun per 13 m (14 yd) of German front. After several postponements, the French bombardment including the super-heavy mortars began on 21 December from Hartmannswillerkopf to Wattwiller. In the afternoon the 66e Division attacked, taking the peak and trenches at Hirtzstein to the north-west of Wattwille as German reserves established a new front line on the eastern slopes.
Next day the reinforced Landwehr Brigade 82 of the 12th Landwehr Division counter-attacked and re-took the peak, except for trenches on the north slope, which fell on 23 December. The French 152e Régiment was almost annihilated, losing 1,998 casualties from 21–22 December, along with Serret who was mortally wounded, the Germans taking 1,553 prisoners. On the afternoon of 24 December, Landwehr Brigade 82 tried to re-gain the lost trenches at Hirtzstein, with the assistance of flame thrower teams but achieved only a partial success. During the evening of 28 December, French attacks captured several positions between Hartmannswillerkopf and Hirzstein, followed by German counter-attacks during the night; from 29–30 December and an attack on 1 January 1916, the original front line was restored and on 8 January, Landwehr Brigade 187 re-captured the trenches at Hirzstein lost on 21 December. The fighting from 20 December 1915 to 8 January 1916 cost the French 7,465 casualties, about 50 percent of the attacking force, of whom 1,103 were taken prisoner, along with thirty machine-guns; German casualties were 4,513 men, 1,700 being taken prisoner. Dubail stopped offensive operations to rest the survivors and to avoid French resources being drained away to little purpose; in Étude au sujet des opérations dans les Vosges (4 January 1916) Dubail recommended that such enterprises be avoided.
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