The second German main line ran through the Bazentins and Longueval, and it was reached and carried by the British Army upon July 14. The intervening fortnight between the battle of the front and of the second line was occupied in clearing the many obstacles, consisting for the most part of woods and subsidiary trenches which filled the space between the two lines, and also in attacking the two villages of Ovillers and Contalmaison, which hampered operations upon the left wing. It will help the reader very much to understand these apparently complex movements if he will realise that they divide themselves into three distinct groups of activity, counting from the north of the line. The first group is concerned with the capture of Ovillers, and in it the Twelfth, Nineteenth, Thirty-second, and Twenty-fifth Divisions are concerned. The second group is connected with the capture of the strong position which is bastioned by Contalmaison upon one side and Mametz Wood at the other, with the Quadrangle system of trenches between. In this very severe conflict the Twenty-third, Seventeenth, Seventh, and Thirty-eighth Divisions were engaged. Finally there is the group of operations by which the right wing was advanced through Bernafoy Wood and up to Trones Wood. In these, the Ninth, Thirtieth, and Eighteenth Divisions were chiefly concerned. We shall now take each of these in turn, beginning with the {106} northern one, the taking of Ovillers, and carrying each narrative to a definite term. Before embarking upon this account it should be mentioned that the two northern corps of Rawlinson's army--the Eighth and Tenth--were from now onwards detached as a separate Fifth Army under Sir Hubert Gough, one of the most rising commanders in the Service. The functions of this Army were to hold the line from La Boiselle to Serre, and to form a defensive flank and pivot for the Third, Fifteenth, and Thirteenth Corps to the south.