The Germans attacked in the Argonne on 20 and 30 June and 12 and 13 July 1915. Joffre complained that Third Army had performed poorly and had "yielded the initiative to the adversary". Joffre transferred Third Army from Dubail’s Eastern Army Group to de Castelnau's Central Army Group, and on 16 July Dubail wrote to de Castelnau expressing his concerns about Sarrail’s leadership, and noting that the Germans opposite had kept up an "aggressive attitude" without undue casualties, whereas Sarrail had attempted to maintain "moral ascendancy" with many small attacks, and had ended up being driven back. On 16 July Joffre asked Dubail to investigate the "persistent lack of success" in the Argonne. Dubail sent two separate reports to Joffre: the one on operations was partly positive, but criticised Sarrail's plans for being "too simplistic" and for keeping his divisions in "rigid zones". The report on morale criticised the "malaise" at Third Army – "lack of mutual confidence" between Sarrail and the XXXII Corps commander and problems in Third Army staff, including allegations of false reports being sent to higher headquarters – and recommended Sarrail's removal.