 14th Division came under heavy attack on 4 April (the Battle of the Avre) and fell back about , but then the enemy were stopped dead by the artillery.All the batteries had been shelled heavily with HE and gas during the preliminary bombardment, and again the OPs were blinded by mist.When the German bombardment shifted to the infantry's front line trenches at 06.20, the field batteries responded by firing their pre-planned 'SOS' tasks blindly into the mist.