In the case of the Germans their army changes took the form of a considerable new levy from those classes which had been previously judged to be unfit, and a general comb-out of every source from which men could be extracted. A new law rendered every citizen liable to national service in a civilian capacity, and so released a number of men from the mines and the factories. They also increased the numbers of their divisions by the doubtful expedient of reducing the brigades, so that the divisions were shorn of a third of their strength. The battalions thus obtained were formed into new divisions. In this way it was calculated that a reserve force had been created which would be suddenly thrown in on one or the other front with dramatic effect. Some such plan may have been in contemplation, but as a matter of fact the course of events was such that the German generals required every man and more for their own immediate needs during the whole of the year. It has been shown in the narrative of 1916 how the British had ended the campaign of that year by the brilliant little victory of Beaumont Hamel, which gave them not merely 7000 prisoners, but command of both sides of the Valley of the Ancre. This victory had been the sequel to the capture of the Thiepval Ridge, and this again had depended upon the general success of the Somme operations, so that the turn of {4} events which led to such considerable results always traces back to the tragic and glorious 1st of July. It was clear that whenever the weather permitted the resumption of hostilities, Sir Douglas Haig was in so commanding a position at this point that he was perfectly certain to drive the enemy out of the salient which they held to the north of Beaumont Hamel. The result showed that this expectation was well founded, but no one could have foreseen how considerable was the retreat which would be forced upon the enemy--a retreat which gave away for nothing the ground which cost Hindenburg so much to regain in the following year.