The French were surprised in two respects. They had not foreseen the rapidity with which the German heavy artillery would reduce the forts in Belgium, the fall of Namur was the greatest catastrophe of the first period of the campaign, and they had not dreamed that the Germans would be able to mobilize so many troops in so short a period. Joffre had planned to meet the Germans along the Meuse and the Sambre, that is along the French frontier, but when the German advance began, his troops on these fronts were outnumbered by at least two to one, not because the mass of the French troops had been sent to Alsace-Lorraine, but because the French had not foreseen the capacity of the Germans to mobilize their reserves and had little more than their first-line troops ready, while the Germans were making use of Landwehr and even Landsturm formations in the first shock. Once this fact was clearly established, Joffre resolutely drew his forces back until he was able to put more reserves in the field and thus approximately restore the balance between the two armies. But he was still heavily outnumbered at the decisive moment, winning his great battle with inferior forces. His enemy had reckoned on the traditional eagerness of the French to attack, and had expected to obtain a decisive victory, through superior numbers, in the first days of the war. The impression which the press reports gave in the early days, that the French were driven from defeat to defeat and almost succumbed to the German attack is far from accurate. In point of fact, the French armies, after suffering marked but relatively insignificant reverses at the outset, reverses due to the blunders of the subordinate generals in part, and to the greatly superior German numbers and artillery in the main, were drawn back in obedience to a carefully conceived plan, were denied the opportunity to fight, as they desired, until the exhaustion of German strength, ammunition, and transport, and the increase in French numbers gave the opportunity for a victory. The whole opening campaign was fought on the French side with a very keen recollection of the mistakes of 1870, and the result justified the strategy. But with the end of the Battle of the Marne both the Allied and the German plans collapsed. Neither side had foreseen clearly the possibility of a battle in which the French might win a decisive victory, yet lack the numbers to enforce the decision absolutely. But the Germans were able to meet the situation promptly and, by preparing a position on the Aisne, to retain a considerable portion of the ground they had occupied in their first rush. Thus in failing to repeat their triumphs of the Franco-Prussian War and of the Seven Weeks' War, they had escaped the disaster of Napoleon at Waterloo, when he, too, had staked all on a single throw.