In 2006, Jack Sheldon also wrote that Allied aerial dominance in August put the Germans at a serious tactical disadvantage, that some troops began to avoid the remaining dugouts and that much of the Entente artillery was used constantly to bombard targets deep behind German lines. J. P. Harris wrote in 2009, that on the German side, conditions were worse and the British improved the accuracy of their artillery-fire, with the help of aircraft observation. At the end of August, Falkenhayn was dismissed, partly due to disagreements over his conduct of the defence of the Somme. Few writers in English have compared the British experience with that of the French Sixth Army. The large British effort on the Somme helped to preserve relations with the French, although Joffre deprecated British the piecemeal attacks of late July to early September.