In 1915, his responsibilities by now crystallised in command of the Northern Army Group, he conducted the Artois Offensive and, in 1916, the French effort at the Battle of the Somme. He was strongly criticised for his tactics and the heavy casualties that were suffered by the Allied armies during these battles, and in December 1916 was removed from command by Joffre and sent to command Allied units on the Italian front; Joffre was himself sacked days later.