This action, described as the first battle of Augustovo, was only a rear-guard action, the Russians desiring merely to delay the enemy for a day or two. German reports, however, described it as a victory only second in importance to Tannenberg. Von Hindenburg then occupied Suwalki. He apparently had become over confident, and hardly realized that Rennenkampf was continually being reinforced by the Russian mobilization.
The Russian High Command understood the situation very well. Their aim was to keep von Hindenburg busy on the Niemen, while their armies in the south were overwhelming the fleeing Austrians. Von Hindenburg was deceived, and continued his advance until he got into serious trouble. His movement had begun on September 7th; his army consisted of the four corps with which he had won Tannenberg, and large reinforcements from Germany, including at least one guards battalion, and a number of Saxons and Bavarians. The country is one vast mixture of marsh and lake and bog. The roads are few, and advance must therefore be slow and difficult. Rennenkampf made no attempt to delay him beyond a little rear-guard fighting. The German army reached the Niemen on September 21st, and found behind it the Russian army in prepared positions, with large reinforcements from Vilna.
The river at this point was wide and deep, and hard to cross. The battle of the Niemen Crossings was an artillery duel. The Russians quietly waited in their trenches to watch the Germans build their pontoon bridges. Then their guns blew the bridges to pieces. Thereupon von Hindenburg bombarded the Russian lines hoping to destroy the Russian guns. On Friday, the 26th, his guns boomed all day; the Russians made no reply. So on the morning of the 27th he built bridges again, and again the Russians blew them to pieces. On the 28th he gave the order for retreat.
He realized that the game wasn't worth the candle; he might easily be kept fighting on the Niemen for months, while the main armies of the Russians were crossing Austria. Von Hindenburg conducted the retreat with a skill which came to him naturally from his knowledge of the marshes.
Rennenkampf followed him closely, keeping up persistent attacks through the woods and marshes. The path of the retreating army lay through the forest of Augustovo, a country much like that around the Masurian Lakes, and there the Germans suffered heavy losses. Von Hindenburg managed, however, to get the bulk of his forces back across the frontier and continued his retreat to the intrenchments on the Masurian Lakes.
The Germans lost 60,000 men in killed, wounded and prisoners, and von Hindenburg handed over the command of the German armies in East Prussia to General von Schubert, and hastened south to direct the movement to relieve the Austrians at Cracow.
But quite as important as the campaign in East Prussia was the struggle in Galicia. When the war began the Germans contemplated merely defense in their own domain; such offense as was planned was left to the Austrians farther south.
Galicia is a long, level country lying north of the Carpathian Mountains, and in this country Austria-Hungary had gathered together a force of hardly less than one million men. A quarter of these lay in reserve near the mountains; the remaining three-quarters was divided into two armies; the first, the northern army, being under the command of General Dankl, the second was that of von Offenberg. The base of the first army was Przemysl; that of the second was Lemberg.
The first army, it was planned, was to advance into Russian territory in the direction of Lublin. The second army, stationed southeast of the first army, was to protect it from any Russians who might strike in upon the south. The first army, therefore, contained more picked material than the second, which included many troops from the southern parts of the empire, including certain disaffected contingents. The first army made its advance as soon as possible, and entered Russian territory on the 11th of August. It went forward with very little loss and against very little resistance. The Russian forces which were against it were inferior in number, and fell back towards the Bug. The Austrians followed, turning somewhat toward the east, when their advance was checked by news of catastrophe in their rear. On the 14th of August the Russian army under General Ruzsky crossed the frontier, and advanced toward the Austrian second army.
The Russian army was in far greater strength than had been expected, and when its advance was followed by the appearance upon the right flank of von Offenberg's command, of yet another Russian army, under Brussilov, the Austrian second army found itself in great danger. Ruzsky advanced steadily from August 14th until, on the 21st, it was not more than one day's advance from the outer works of Lemberg, and the third Russian army under Brussilov was threatening von Offenberg's right flank.