Some men adapted to trench warfare, adopting a system of "Live and Let Live," with countless informal, local truces. Generals on both sides tried to stir things up, with raids across No Man's Land and big offensives. After the terrible failure of the Somme offensive the allies continued to develop new tactics and weapons to break the German line. In November 1917 at Cambrai, British tanks rolled five miles beyond the German lines. Church bells rang out across Britain. But the Germans soon re-occupied lost ground. The Victors on the Western Front would have to learn how to consolidate success.