This was officially described as a subsidiary operation, yet upon the assistance it rendered to the main attack farther south depended the whole nature and course of the campaign. Had that thrust eastward towards Bapaume been successful, the Germans facing the Somme would have been taken in the rear, and the painful and costly climb up the slopes to Bapaume, which lasted throughout the summer and autumn, would have been achieved in a couple of days. Places like Pozières, well towards the goal, were indeed given as our objectives for the first day of the battle of the Somme. It began on 1 July. Since the middle of June there had been an intermittent bombardment of the German lines which grew in intensity and extent from the 24th. The attack had been entrusted to the British Fourth Army, under Sir Henry Rawlinson and the French Sixth under Fayolle. It was expected by the Germans between Albert and Arras, though not along the Somme, and their artillery preparation took off some of the edge of our attack. The troops advanced with the utmost dash and determination, and detachments got far ahead of the line into Pendant copse, Thiepval, the Schwaben redoubt, and even the outskirts of Grandcourt. But few of them got back when they found that the line as a whole had held, and the losses of these troops in the fire to the left and the right and in front of them made up the bulk of the British casualties on that day. Farther south they fared better. The outskirts of La Boisselle and Fricourt were reached; Mametz was taken, and also Montauban by the most striking advance of the day. On our right the French, whose attack had been planned by Foch, had the advantage of a surprise. North of the Somme they reached the edge of Hardecourt and Curlu; south of it they captured Dompierre, Becquincourt, Bussu, and Fay, and with these villages 6000 prisoners. The advance was greatest the farthest it was removed from where the Germans had prepared their resistance; complete success south of the Somme dwindled away to complete failure at Serre. That northern attack was not renewed, but from Ovillers south and eastwards the advantage was stubbornly pressed on the 2nd. Fricourt fell and its surrounding defences, while the French took Frise, Curlu, and Herbecourt. It was clear, however, that the German line had not, and could not be broken in the sense which the public at least attached to the word. A first or even a second and third line of trenches might be taken, but there was an indefinite series behind, and the progress was so slow that anything like a thrust right through the German defences and rout of the German forces was out of the question. It was not until the 5th that La Boiselle in the first German line was mastered, and farther east the initial success of the British was checked by a line of woods which required weeks to clear. On the 7th we took Contalmaison, but were driven out of most of it by a counter-attack. It finally fell on the 10th, but