Other causes had checked the Russians farther north. Brussilov's offensive may have been merely a vast reconnaissance in force, but its astonishing success had stirred the Germans to prompt action. Ewarts was beginning an attack on the important junction of Baranovitchi north of the Pripet marshes, and presently the line of battle spread down the Shchara and along the Oginski canal. If he succeeded like Brussilov, Brest-Litovsk might be caught between two fires with dire results to the whole German front in Russia and future in the Balkans. It was a peril to which the German prospects at Verdun and forebodings on the Somme were secondary considerations; and both the Western allies profited from Brussilov's campaign. One German corps was hurried from Verdun to Kovel in six days, and others followed at a less exhausting speed. Austrians also came from the Tyrol and the Balkans, and Ludendorff was sent to restore confidence in the command. Kovel was the southern key to Brest-Litovsk; the northern flank could look after itself since Ewarts was making little progress, and Bothmer had barred the way for the time to the other essential points at Lemberg and Stanislau. But Kovel was in serious danger, for the Russians had penetrated to Lokatchi due south of that fortress; and it was for its defence that Ludendorff organized the Austrian counter-offensive in the latter half of June.

Kovel was saved. The Russian line was pressed back from Lokatchi to Zaturtsky, from Svidniki to Rojitche, and behind the Stokhod. But the counter-offensive was spent by the end of the month, and early in July the Russians resumed their advance. North of the Pripet Ewarts was no more successful than he had been in June; German divisions were made of sterner stuff than the Austrian, and Hindenburg knew well enough what was at stake. After heavy losses the Russian attack died away without appreciable gain of ground, and north of the Pripet at least the enemy line was secure. Nor, even south of it, was Brussilov able to do much more than straighten his own, bringing it forward to the point reached by his salient in front of Lutsk. This, however, involved some danger to Lemberg and effected the fall of Stanislau farther south. The chief obstacle was Bothmer in the centre, on whose stubborn resistance the Germans prided themselves although most of his troops were Austrian; and he occupied most of the Russian attention for the rest of the campaign. But the most striking advance was made in the north of Brussilov's command, where summer had dried the low-lying ground south of the Pripet marshes. Here General Lesch, whose Third Russian Army had been brought down from north of the Pripet, broke the Austrian line on the Styr between Kolki and Rafalovka on 4-5 July, and in four days reached the Stokhod. He even crossed it at points, but failed to carry it in its entirety so as to threaten the northern defences of Kovel.

The main offensive was launched in Galicia, doubtless with a view to its reaction upon the attitude of Rumania; and here Bothmer was menaced by Sakharoff in the north and Lechitsky in the south. To disconcert the northern attack the Germans had planned a counter-offensive on the 18th, but Sakharoff got his blow in first three days before. Forcing the Austrians across the Styr in front of Dubno, he advanced along its tributary the Lipa, captured Mikhailovka and Bludov, and then swinging south occupied Berestechko and threatened Brody on the 20th. It was entered after a week's fighting on the 28th. Thence he struck south towards the railway from Krasne to Tarnopol which supplied Bothmer's left, while Bothmer's right was being simultaneously threatened by Lechitsky now that the floods on the Dniester had subsided. On 7 August he recaptured Tlumacz and reached the Dniester near Nijniow; on the 10th he forced his way into Stanislau, while Scherbachev attacked on the north bank of the Dniester. Almost outflanked on the north by Sakharoff and on the south by Scherbachev and Lechitsky, Bothmer had at length to retreat to the Zlota Lipa with his right in front of Halicz, his centre at Brzezany, and his left at Zborov. He was vigorously attacked by Scherbachev, and his right was pushed back on both banks of the Dniester as far as Halicz until it stood upon the Narajovka. But the centre stood firm against Scherbachev's great effort of the 29th, though Potutory was taken and Brzezany reduced to a salient; and the fighting of September and October failed to modify the position anywhere except far south in the Carpathians, where Lechitsky secured Mount Kapul and the Jablonitza and Kirlibaba passes, and advanced as far west as Huta.

This movement was in sympathy with the Rumanian declaration of war on 27 August, and spoilt the Russian chances of a successful concentration against Bothmer. Russia was not sufficiently furnished with munitions or trained men to provide for two great efforts on that front, and her summer campaign had failed of complete success largely because of the services it rendered to her allies. No fewer than sixteen divisions were withdrawn, between June and September, by the Germans from the Western front and one from the Balkans to meet Brussilov's offensive, and they included some of the best of the Prussian Guards. Austria diverted seven divisions from Italy, and even the Turks sent two. The offensive had cost the Central Empires something like a million casualties, many of them Czecho-Slovak and Jugo-Slav prisoners, who deserted willingly enough and in time did valiant service in strange lands to the cause of the Entente and of their own national independence. But the value of Russia's last great effort in the war was not limited to the front on which it was made. It was an excellent, though almost solitary, example of the advantages of co-ordinated strategy between the Allies, and what progress was made on the Somme, in Italy, and in Macedonia in 1916 was partly due to Russian valour on other fronts.

The British Empire, however, had eyes in the summer of that year for little except its own offensive in the West. It was mainly a British affair, for the German attack on Verdun had succeeded to the extent of making impossible both an independent French offensive and an equivalent French contribution to the joint campaign on the Somme. Like other realities of the war, this fact was hidden from the public, and hopes ran high. The failures of the autumn were recognized as due to their being premature and made on narrow fronts. We had learnt our lesson; there was a new general in command; in guns and munitions we had outstripped the Germans; our men were no longer raw recruits, and we had millions of them; and, unlike Germany, we had no alternative front to exact its toll like the Russian. The one doubt that was harboured rather than expressed related to leadership. Lord Kitchener had lost his life in the Hampshire, sunk by a mine off the west coast of the Orkneys, on 6 June. But Sir William Robertson, his chief of Staff, had acquired a great repute as an organizer, and the question was whether the officers in the field would exhibit qualities of intellect comparable with his administrative capacity or with the valour of their men.

Apart from the urgent need of relieving the pressure on Verdun, a British offensive was due as a contribution to the common task; and the front on which it would be made did not offer a great variety of choice. Whatever attractions other localities may have held out yielded to the Somme, where the French and British lines met by Maricourt, and an advance side by side was the nearest approach the Allies had yet made to unity of command or even of design. The combined effort was to be concentrated on a single front of twenty-five miles from Gommecourt, half-way between Albert and Arras, to Fay, five miles above Chaulnes. If it achieved the success that was hoped, it would roll up the German line north towards the Belgian coast and render untenable in the south and east the great salient of the German front. The retreat which the Germans effected to the Hindenburg lines in the spring of 1917 was the least that was expected from the summer offensive of the year before. But Germans are seldom idle, and for months they had been silently and unobserved preparing to counter the vast storm of explosives about to break on their trenches. That wire-entanglements however extensive, and trenches however intricate, could be obliterated had been proved, and the Germans were ready with their prophylactic on the ground that was chosen for attack. The rolling downs of the Bapaume ridge offered natural attractions to an army sick of the water-logged flats of Flanders, but they also afforded the Germans depth and scope for their vast underground chambers which no artillery could destroy; and these defences more than any other single cause defeated the British thrust at Gommecourt and Serre.

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 Pozires, 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 Ovillers held out till the 16th. The woods to the right offered a no less stubborn resistance. Bernafay wood was, indeed, gained on the 4th, but the German flanks in Mametz wood to the west and Trnes wood to the east were only driven in at the cost of five days' ferocious fighting from the 8th to the 13th. The French encountered similar opposition north of the Somme, but south of it they were more fortunate. On the 4th and 5th they extended their gains on their right by the capture of most of Estres and Belloy, and after disposing of German counter-attacks leapt forward on the 9th past Flaucourt to Biaches, a mile from Pronne.

On 14 July the second stage of the battle of the Somme began with an attack before dawn. It was the national fte-day of France, but the attack was made on the British front from Contalmaison to Trnes wood. The objectives were the wood and two villages of Bazentin, High wood (the Bois des Foureaux), Longueval, and Delville wood, while Trnes wood still remained to be completely cleared. The day was one of the most successful in the four and a half months' battle, and the dash of the British troops carried them as far as all their objectives. Bazentin-le-Grand and le Petit and the wood were taken; aided by an unwonted cavalry charge which raised delusive hopes of breaking through, a great advance was made to High wood; and the Germans were driven out of most of Longueval and the Delville wood. But it was more difficult to retain these conquests; the advanced positions were exposed to enfilading German fire, and counter-attacks drove us back at various points and made the retention of others a matter of desperate conflict for weeks. High wood had to be completely evacuated; for Delville wood the South Africans, and the troops which relieved them on the 20th, had to struggle for thirteen days, and it was not wholly cleared for another month. Much of what was credited to the 14th of July had to be retaken in detailed fighting spread over many days.