Across these blocks lively exchanges of bombs and rifle grenades spasmodically occurred. The distance separating the opposing sides was, however, so small that artillery and trench-mortars could be used by neither owing to the danger of short rounds inflicting casualties on friends as well as foes. In these circumstances the left flank in the front and support lines was very unprotected and presented to the enemy a "raw edge." It was an uncomfortable situation, as there appeared to be every prospect of the enemy's developing his initial success by a flank attack delivered southwards from the area into which he had penetrated. The feeling of apprehension on this score was accentuated by the fact that if he supported this attack with a similar concentration of artillery, the absence of shell-proof dug-outs in the Neuville St Vaast sector would ensure for him success. In these circumstances the artillery would have had an easy task, as this sector was completely overlooked by a high crater called Broadmarsh, from which the Germans obtained magnificent observation of the whole Divisional left front. Broadmarsh crater was an awe-inspiring feature that appeared to follow one with its eyes wherever one went. It was like a volcano that might erupt at any moment, and played a prominent part in every minor enterprise which took place in its vicinity. In these adverse circumstances it became clear that the only way a hostile attack against the Neuville St Vaast sector could be defeated was by employing to the full every day's grace which the enemy gave. A defensive flank was therefore sited and its construction begun, so as to round off the defences where the troops were in closest contact to the enemy and present to him a continuous front rather than an edge. The digging of a reserve line was also put in hand, and the construction of a large number of shell-proof dug-outs begun. In actual fact the enemy made no further attacks, but he maintained a continuous activity with artillery and trench-mortars. Later, after the Somme battle had begun, the calls made on the German troops compelled him to relax his efforts considerably. The feeling of tension was thus appreciably lessened, though the sector could at no time be described as a quiet one. During this period of anxiety the situation was made still more difficult by a snap of bitterly cold weather in June, which had followed a period of violent rain-storms. The result was that a number of cases of trench-feet occurred in midsummer, when all materials and stores used for the prevention of this complaint had been handed in as no longer required.