As in the last sector, work in the defences was considerably hampered by the enemy's artillery and trench-mortars, which were constantly levelling the British trenches. As usual, appeals for artillery retaliation could seldom be met, owing to the paucity of ammunition. It became most discouraging to the men to see their breastworks being damaged and destroyed in this manner, their labours of the previous night often being undone in a few minutes, without it being possible to fire a round in retaliation. In this sector life in the trenches was made more uncertain than ever by the introduction of the rifle grenade by the Germans. In the early part of July, Colonel Ian Stewart, D.S.O., Scottish Rifles, who had joined the Division as G.S.O. 1 in June, formulated a scheme of training every man in the use of the bomb. Bombing, before this innovation, had been regarded as the duty of specialists. The new scheme was that every man should be trained to be able to light and throw a bomb in the case of an emergency. At the same time the brigade grenadier companies were put through a longer and more thorough course of instruction than had been the case in the past. The introduction of this scheme marked a big advance in the practice of bombing. On 20th July orders were received that the Division was to join the Xth Corps under the command of General Morland, in the area of the newly-formed Third Army. The Xth Corps was then to consist of the 5th Regular Division, the 51st Territorial Division, and the 18th Service Division. Accordingly during the nights 22-23rd and 23-24th July the Division was relieved in the line by the Lahore and 8th Divisions. On the 26th, 27th, 28th, and 29th of July the Division proceeded by train to the Neuilly area east of Amiens. CHAPTER III. THE PERIOD OF APPRENTICESHIP. It was some ten weeks since the Division had heard its first shot fired. Up to the present it had, indeed, experienced war. It had, however, been employed throughout either in actual battle or in consolidating a battle front in particularly trying circumstances. It had, therefore, had little time or opportunity to collect its thoughts and profit by its experiences. During the next few months it was given the opportunity it required, and it will be seen that these months were profitably employed by all ranks. This period may be called the Division's apprenticeship to war. In this connection it must not be forgotten that, in spite of its late successes, there was a time when the Highland Division was what can best be described as "green." That this was the case is no reflection on the spirit which animated the men or the manner in which the troops had been trained by their commanders. Under the conditions of modern warfare it could not have been otherwise.