The advance of the French troops to the frontier, while as yet imperfectly mobilized, which was an extremely hazardous measure in itself, was evidently with the intent of utilizing the temporary advantage of having a superior force at immediate disposition by taking at unawares the German armies in the act of developing their advance-movements. But, notwithstanding, the German commanders did not deviate from their purpose of promptly effecting this first advance in front of the Rhine. The railway transport of the Corps of the IInd and IIIrd Armies, however, ended at the Rhine; thence the troops marched on foot into the cantonments prepared on the left bank of the river. They moved in echelon, advancing only so many at a time as would make room for the body in rear, in the first instance to the line Bingen-Duerkheim-Landau. The farther advance towards the frontier was not to be undertaken until the Divisions and Corps were all assembled, and provided with the necessary trains; and then they were to march forward in a state of readiness to confront the enemy at any moment. The massing of the Ist Army appeared to be less threatened, because its route was protected by neutral territory, and was covered by the garrisons of Treves, Saarlouis and Saarbruecken, the German outposts on the Saar. The Ist Army, 50,000 strong, was concentrated at Wadern, in the first days of August. The IInd Army, which meanwhile had been increased to a strength of 194,000 men, had pushed forward its cantonments to Alsenz-Guennstadt, at the farther base of the Haardt Mountains, a position which had been thoroughly inspected by an officer of the General Staff, and where the troops might confidently await an attack. The 5th and 6th cavalry Divisions were reconnoitring the country in front. The IIIrd Army was still assembling on both banks of the Rhine. The French so far had made no serious attempt at Saarbruecken; Lieutenant-Colonel Pestel, with one battalion and three squadrons, was able successfully to withstand their petty attacks. It had meanwhile been observed that the hostile forces were moving farther to the right, towards Forbach and Bitsch. This seemed to indicate that the two French Corps known to be about Belfort and Strasburg, might purpose crossing the Rhine and marching through the Black Forest. It seemed therefore all the more important that the IIIrd Army should be set in motion as early as possible, for one thing to protect the right bank of the Upper Rhine by an advance on the left; for another, to cover the left flank of the IInd Army during its advance. A telegraphic order to that effect was despatched on the evening of July 30th, but the Head-quarters of the IIIrd Army wished to wait for the arrival of the VIth Corps and of the trains. Whereupon, regardless of this delay, the IInd Army was put in march towards the Saar, where the French were beginning to be active.