Next day, Brigade 82 of the 12th Division counter-attacked with reinforcements and re-took the peak, except for trenches on the north slope, which fell on 23 December. The French 152e was almost annihilated, suffering 1,998 casualties from 21 to 22 December, along with Serret who was mortally wounded, the Germans taking 1,553 prisoners. On the afternoon of 24 December, 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 to 30 December and on 1 January 1916. The original front line was restored and on 8 January, Brigade 187 re-captured the trenches at Hirzstein that had been lost on 21 December.