The first army went forward with very little loss and against very little resistance. The Russian forces which were against it, which we may call the first Russian army, were inferior in number, and fell back, though not rapidly, towards the Bug. It relied to some extent in this movement upon the protection afforded by the forts of Zamosc, but it was never in any serious danger until, or unless, things went wrong in the south. The Austrians remained in contact (but no more), turned somewhat eastward in order to keep hold of the foe, when their advance was checked by the news, first of unexpected Russian strength, later of overwhelming Russian advances towards the south. Long before the third week in August, the first Austrian army was compelled to check its advance upon the news reaching it from the second, and its fortunes, in what it had intended to be a successful invasion of Russian Poland, had ended. For the whole meaning of the first Galician campaign turns after the 14th of August upon the great Russian advance in the south. It was upon that day, August 14, that the Russian force, under General Russky (which we will call the second army), crossed the frontier. Its right occupied Sokal, its centre left moved in line with the right upon von Auffenberg's force directly before it. The Russian mobilization had proceeded at a greater pace than the enemy had allowed for. The Russian numbers expected in this field appeared in far greater strength than this expectation had allowed for, and it was soon apparent that von Auffenberg's command would have to resist very heavy pressure. But it would be an error to imagine, as was too hastily concluded in the press of Western Europe at the time, that this pressure upon the front of the second Austrian army, with its dogged day after day fighting and mile by mile advance, was the principal deciding factor in the issue. That deciding factor was, in fact, the appearance upon the right flank of von Auffenberg of yet another Russian army (which we will call the third) under Brussilov. It was the menace of this force, unexpected, or at least unexpected in its great strength, which really determined the issue, though this was again affected by the tardiness of the Austrian retirement. Russky's direct advance upon the front of his enemy extended for a week. It had begun when it had destroyed the frontier posts upon Friday, the 14th. It was continued until the evening of the succeeding Thursday, regularly, slowly, but without intermission. It stood upon the Friday, the 21st--the day on which the first shots were fired at the main Franco-British forces in the West, and the day on which the first shell fell into Charleroi station--not more than one day's cavalry advance from the outer works of Lemberg, but it was just in that week-end that the pressure of Brussilov began to be felt.