On the same day Stryj fell to Von Linsingen and on 7 June he forced the Dniester at Zurawno. But he had advanced too far ahead of his communications and reserves, and on the 8th Brussilov drove him back over the Dniester with severe losses. The Dniester was indeed the scene of stubborn fighting for many days, and on the 18th the Russian Government announced that the enemy had lost between 120,000 and 150,000 men in their efforts to cross it on a front of forty miles. But the Russian stand on the Dniester only left it to Mackensen's centre and left to turn the Grodek position and ensure the fall of Lemberg. By 20 June the Russian communications north of the Galician capital were severed by a battle at Rawa Ruska, and on the 22nd, after nine months' Russian occupation, it once more fell into Austrian hands. The Russians had not done much to commend their cause to the inhabitants during their stay; the opportunity was seized for proselytizing in the interests of the Orthodox Church, and Sczeptycki the Archbishop of Lemberg, a member of the Uniate Church which had made terms with Roman Catholicism, was treated with a harshness compared with which the indignities inflicted by the Germans upon Cardinal Mercier of Malines were trivial; he was interned in a Russian monastery and deprived of all religious rites save those which were to him heretical.

The fall of Lemberg was followed by the loss of the Dniester line as far as Halicz, and all beyond it including the Bukovina, and the Russians fell back behind the Gnilia Lipa, where Ivanov prolonged a stubborn resistance. But the aims of the Germans in Galicia had been achieved with the capture of Lemberg except in so far as the remnants of the Russian armies remained intact. The city formed a formidable bastion for defence because of its ample lines of communication with the south and west, and inadequate lines to the north and east. A farther German advance across the Russian frontier in that direction would be an eccentric movement, and the front of attack was accordingly swung round from east to north, where the Russian position in Poland had been outflanked. The reconquest of Galicia produced fruits enough in the restoration of Austrian and Hungarian confidence and the repression of pro-Entente tendencies in the Balkans. But it was only a part of the most ambitious and successful campaign the Germans fought in the war. May and June were but the prelude to greater successes in July, August, and September.

The heaviest blows were to be struck in the Polish centre, but diversions had already been made on the extreme German left in the north. Libau had fallen on 9 May, and during that and the following month the German armies under Von Buelow overran the duchy of Courland as far as Windau on the coast and Shavli half-way to Riga. This movement was regarded with comparative indifference as being a divergent operation calculated at worst to do no more than distract Russian forces from more critical points. But it was in keeping with a German design considered grandiose until it nearly succeeded. The bulk of Russia's forces were concentrated in the Polish triangle of which the apex was at Warsaw, the base ran from Kovno by Brest-Litovsk to the Galician frontier, the north-western side in front of the railway from Kovno to Warsaw, and the southern in front of that from Warsaw to Lublin, Cholm, Kovel, Rovno, and Kiev. The German plan was not merely to squeeze the Russians out of the triangle by pressure on the sides and intercept as much of their forces as possible, but also to outflank the whole position by striking behind the base from the north at Vilna; and a naval attack on Riga was part of the projected operations.

The Galician drive had furnished the territorial means for the attack on the southern side of the Polish triangle; and although Ivanov was farther pushed back from the Gnilia Lipa to the Strypa and thence almost to the Sereth, this Eastern advance became irrelevant to the main strategic design, and German reinforcements were collecting mostly under Gallwitz, Scholtz, and Von Eichhorn along the Narew and the Niemen for an onslaught on the north-western side of the triangle. The Austrian Prince Leopold's forces which fronted Warsaw on the Bzura at the apex were comparatively weak, and were only intended to gather the fruits of the real fighting done by the Germans on the flanks. The Germans rode roughshod enough over Austrian susceptibilities when efficiency required it; but they atoned for the brusqueness by conceding a large share in the spectacular aspects of triumph; and just as the Austrians entered Lemberg first and not its real conqueror Mackensen, so Prince Leopold was cast for the part of the victor of Warsaw. But first of all the Galician armies had to face north to take their allotted share in the scheme by driving the Russians back across the railway between Lublin and Kovel.

Within a few days of the fall of Lemberg they had crossed the Russian frontier, turning the Vistula and advancing in two columns, one under the Archduke Joseph towards Krasnik on the road to Lublin, and the other farther east under Mackensen towards Krasnostav on the way to Cholm. The Russian army in Poland west of the Vistula had gradually to conform to the retreating line and fall back in a north-easterly direction towards the river. By 2 July the Archduke was in Krasnik, but here he was checked by the Russian position defending the railway line; on the 5th the Russians, who had been reinforced, counter-attacked, and in a battle lasting till the 9th drove the Austrians back. Similarly Mackensen found himself held up between Zamosc and Krasnostav, and for a week the struggle for the Lublin-Cholm railway resolved itself into an artillery duel. The attack was resumed on the 16th simultaneously with Von Gallwitz's movement against the other side of the triangle. The Archduke failed after ten assaults to carry the Russian position in front of him at Wilkolaz, but Mackensen was more successful at Krasnostav. He enveloped the Russian right, drove it beyond Krasnostav, and was soon within striking distance of the railway.

Meanwhile, to the north Gallwitz had forced the Russians from Prasnysz towards the Narew on the 14th, and crossed it himself on the 23rd between Pultusk and Rozhan as well as between Ostrolenka and Lomza; and by the 25th he was on the banks of the Bug, within twenty miles of the railway connecting Warsaw with Petrograd. The great line of fortresses along the Narew were now exposed to bombardment by German howitzers; the Russians in front of Warsaw withdrew from their winter defences along the Rawka and Bzura to the inner lines of Blonie; and south of Warsaw they retired from Opatow, then from Radom, and then to the great fortress of Ivangorod on the Vistula. Even that was now threatened by Mackensen's advance to the Lublin line in its rear. It was broken on the 29th, and on the 30th the Germans were in Lublin and Cholm. Warsaw was doomed, and, indeed, the Grand Duke Nicholas had as early as the 15th decided upon its evacuation. The fighting along the Lublin-Cholm line, and the strenuous resistance the Russians offered on the 26th to Gallwitz's renewed attacks on the Narew, were intended not to save Warsaw, but the armies defending and the stores within it. On 4 August the troops abandoned the Blonie lines and marched through the city, blowing up the bridges across the Vistula. Next day Prince Leopold made his triumphal entry, and the first year of the war closed on the Eastern front with an event of greater significance even than that which the Kaiser attached to it. To him the capture of Warsaw was a resounding tribute to the success of German arms: to future generations the import of the Russian departure will doubtless be the term it set to Russian rule in Poland, and it may be deemed one of the ironies of history that Hohenzollern autocracy should have been made the instrument to wreck the Russian domination. In spite of themselves the Germans assisted to achieve the common purposes of the great war of liberation.

Russian autocracy was indeed stricken to death by its own inherent maladies nearer home than Poland. Shallow democrats in the West were deploring the lack of prevision and provision exhibited by their democratic Governments, but no democracy endured a tithe of the sufferings inflicted upon Russian soldiers by the blindness, incompetence, and corruption of the bureaucratic Tsardom. Confident in the successes which the heroism of its troops had won over the discordant forces of the Hapsburg Empire and those which Germany could spare from the Western front, it had neglected to perform any of the promises it had made to conciliate the inhabitants of Poland and Galicia, and had even failed to take the commonest military precautions to safeguard its victories. Nothing had been done in Galicia to put the captured Przemysl into a state of defence, and even the bridge across the San had not been repaired to provide a direct line of supply to the front on the Dunajec. Offers of skilled labour from other countries to improve the inefficient service of Russian railways and the inept direction of industries and munition factories were ignored. The business organization of Russia had been managed mainly by Germans before the war; too much of it was left in their hands after war began, with the result that the Putilov munition works, for instance, were reduced to half-time by German control; and there was no one to take the place of those who departed. Russian generals were among the most skilful of strategists, and men like Ruszky, Alexeiev, Brussilov, and others would have been invincible had Russia's man-power been competently equipped. As it was, every sort of provision was neglected; the artillery of one army was limited to two shells a day; a whole division had on one occasion to face an attack without a rifle among them, and troops were put into trenches relying for weapons on those which fell from the hands of their dead or wounded comrades. These were the organized atrocities of autocratic bureaucracy, and it was little wonder that in time they bred in the breasts of Russian soldiers a fiercer resentment against their rulers who betrayed them than against the enemy whom they fought.

The retreat which followed the fall of Warsaw was sympathetically represented as a masterly operation, and the failure of the Germans to envelop and isolate the Russian armies as proof of the breakdown of their strategy. But all retreats in the war, with the exception of the Turks' before Allenby, were similarly described in the appropriate quarters. It was the common characteristic of the victors that they could not win decisive battles in the sense of earlier wars, and of the vanquished that they evaded the expected Sedans and Waterloos. Even the Germans with all their initial advantages of preparation and surprise could not break the Allied armies in their first offensive on the West, and the same inability dogged their still more rapid footsteps in the East. It is a consequence of the reliance of modern armies on the mechanical force of artillery to which the Germans were especially addicted; for while 16-inch howitzers could pulverise any position, they could not pursue with the speed required to encircle and capture armies in the field. Hence salients, which when viewed in the light of older conditions seemed traps which could not be eluded, were in practice evaded because, with Allenby's one exception, cavalry failed to atone for the slower movement of the more powerful arm of artillery. There was nothing therefore miraculous in the Russian escape, and the strategy of the Grand Duke was hardly so brilliant as it was represented. At the beginning of the war Alexeiev, then Ivanov's chief of staff, is said to have counselled a Russian retreat like those which lured Charles XII and Napoleon to their doom; but the temptations of Austrian weakness and German concentration on the West and the plight of France and Belgium led to the adoption of other advice and the premature invasion of Prussia, Galicia, and Hungary; and in August 1915 it was too late for a voluntary and innocuous retreat. The safety of the majority had to be bought at a heavy price in casualties, in loss of guns and material, in suffering for the troops and civilians, and in national dejection. What might have been cheerfully done by choice was despondently done by compulsion.

The evacuation of Warsaw was the first step in the withdrawal from the apex of the Polish triangle which it was hoped the resistance of the sides would enable the Russians to complete without disaster; and a large garrison with adequate guns and ammunition was left at Novo Georgievsk to impede the German advance and hamper communications with their front. The greatest menace was on the north-west along the Narew and beyond in Courland where Von Buelow was preparing to strike behind the base of the triangle. On 10 August Von Scholtz breached the line of fortresses by storming Lomza, but Kovno was a much more critical point. It was the angle of the base, and its fall would not only threaten the base running south to Brest-Litovsk and all the Russian armies west of that line, but would greatly facilitate Von Buelow's sweep round beyond it and Vilna. The bombardment began on the day that Warsaw fell. Kovno was expected to hold out at least to the end of the month, but it fell on the 17th, and the general in command was subsequently sentenced to fifteen years' hard labour for his inadequate defence and absence from his post of duty. On the following day Von Gallwitz cut the line between Kovno and Brest at Bielsk, and on the 19th Novo Georgievsk fell to the howitzers of Von Beseler, the expert of Antwerp. Ossowiec, which had stood so well against the earlier German invasions, followed on the 23rd, and Von Beseler was brought up to give the coup de grce to Brest. Its loss was perhaps inevitable after the fall of Kovno, but it completed the destruction of the base of the triangle and involved the withdrawal of the whole Russian line beyond the Pripet marshes which would break its continuity; and there was cold comfort in the fact that Ewarts got away with most of his troops and stores and that a Russian mine, exploded two days after their departure, destroyed a thousand Germans and set a precedent for similar machinations on their part when they retreated in the West.

Fortresses now toppled down like ninepins. On the 26th Augustowo was evacuated and Bialystok captured. On the 27th Olita was abandoned and on 2 September Grodno. The Germans thus gained the whole line from Kovno to Brest, and things were going no better in the south. The fall of Lemberg had given the German right a position far to the east of their left, and Mackensen advancing from Lublin and Cholm had driven the Russians across the Bug at Wlodawa before Brest-Litovsk was taken. The marshes of Pripet were at their driest in August, and Mackensen encountered few obstacles as he pressed on from Brest to Kobrin and thence to Pinsk along the rail to Moscow. In Galicia Ivanov was pushed back to the Strypa and then the Sereth, and on the upper reaches of those rivers Brody was captured and two of the Volhynian fortresses, Dubno and Lutsk. Rovno itself was threatened, and with it the southern stretch of that lateral railway from Riga to Lemberg on which the Germans had set their hearts.