The choice of Flanders, its climate, the selection of General Hubert Gough and the Fifth Army to conduct the offensive, debates over the nature of the opening attack and between advocates of shallow and deeper objectives, remain controversial. The time between the Battle of Messines and the first Allied attack (the Battle of Pilckem Ridge, 31 July), the extent to which the internal troubles of the French armies influenced the British, the effect of the exceptional weather, the decision to continue the offensive in October and the human costs of the campaign are also debated.