The great strategical plan of the Germans, which had displayed itself throughout the entire operations on the western theatre of war from the very first gun of the campaign, came to its apex on this September 3, 1914. If the allied armies could develop a strong enough defense to halt the German offensive at this point, and especially if they could develop a sufficiently powerful counteroffensive to strike doubt into the confident expectations of the armies of the Central Powers, then the strategical plan had reached a check, which might or might not be a checkmate, as the fortunes of war might determine. If, on the other hand, the stand made by the Allies at this point should prove ineffective, and if the counteroffensive should reveal that the German hosts had been able to establish impregnable defenses as they marched, then the original strategic plan of the attackers must be considered as intact and the peril of France would become greatly intensified. It is idle, in a war of such astounding magnitude, to speak about any one single incident as being a "decisive" one. Such a term can only rightly be applied to conditions where the opposing powers each have but one organized army in the field, and these armies meet in a pitched battle. None the less, the several actions which are known as the Battles of the Marne may be considered as decisive, to the extent that they decided the limit of the German offensive at that point. The German General Staff, taking the ordinary and obvious precautions in the case of a possible repulse, chose and fortified in the German rear positions to which its forces might fall back in the event of retreat. These prepared positions had a secondary contingent value for the Germans in view of the grave Russian menace that might call at any moment for a transfer of German troops from the western to the eastern front. The Battle of the Marne stopped the advance of the main German army on that line, forcing it back. [Illustration: Battle of the Marne--Beginning on September 5, 1914.]