Currie and Monash (Australia) were probably the two best Allied generals of the Great War. Currie in particular has been criminally neglected by his country. The Vimy Ridge campaign is a textbook example of an assault on a fortified objective.
The Canadians were the first to breach the German Wall at any point ... unfortunately, having accomplished this they didn't follow up by pouring men and equipment thru the breach and wrapping around to both the north and south and attacking the Germans from the rear. This tactic, had it been employed, could have easily collapsed the German line in both directions for at least fifty miles.