You mean the way we almost legged it after Gough's 5th army was smashed at the start of the Spring Offensive and it was only the Fr re-inforcements and Foch being put in over-all command that saved the Amiens rail-head and prevented a breech between the armies?
Some of us have studied this post-grad, mate. I can send you an essay if you want. Got a goodish A, obv.