With the formation of the 'triple entante' between France, Russia, and Great Britain prior to the first world war, Bismark's [the german chancellor] worst fears were realised in that it became obvious that the approaching war would have to be fought on two fronts instead of one [it had been Bismarks desire to 'keep the russians on side' so that war could be restricted to a single theatre inFrance/Belgium]. A calculated risk was taken when the 'Schliffen Plan' was initiated in 1914 - one that was based on the assumptions that France would be able to mobilise in approximately the same time that Germany could [about 2 weeks], where Russia would take about 6 weeks, given the much bigger distances and poorer rail network that pertained. The assumption was that the French would be rapidly defeated and the window of time be used to bring the german forces back to deal with the russian forces on the second front. The problem was that by the time the Schliffen Plan was put into opperation it was already a decade plus out of date given that it assumed a french state of unpreparedness resulting from it's recent defeat [when the plan was devised] in the franco-prussian war. This was not however the case some twenty or so years later in 1914. The french had used the intervening years well and as a result were able to mobilise a force approximately equal to that of the german opposition. Also von Moltke [the nephew] was an indecisive and 'tinkering' commander without the boldness and flair that the bold plan demanded. As a result the german advance was stalled and thus commenced the extended and wastefull war of atrition that occupied the opposing forces in the trenches for the next four years.
My question is this. Why did not the 'other war' of the second front result in a swift russian defeat of the minimal german forces ranged against them, freeing the russian army thence to make it's way leisurely to the rear of the german forces, where it could have brought about a swift and decisive end to what was to become perhaps the worst waste of human life that ever occured on the field of war?
[There is probably a really simple answer to this that will expose me as a fraud in the thin patina of knowledge I have pretended to above

]