In the early 20thC contect, Mobilization isn't just a step, but stepping onto a slide called War. Everyone had plans and timetables.
August 18th, 1892
The Franco-Russian Alliance Military Convention
This Convention was not made public until 1918 by the new Soviet Government.
France and Russia, being animated by a common desire to preserve peace, and having no other object than to meet the necessities of a defensive war, provoked by an attack of the forces of the Triple Alliance against either of them, have agreed upon the following provisions:
Article 1. If France is attacked by Germany, or by Italy supported by Germany, Russia shall employ all her available forces to attack Germany.
If Russia is attacked by Germany, or by Austria supported by Germany, France shall employ all her available forces to attack Germany.
Article 2. In case the forces of the Triple Alliance, or of any one of the Powers belonging to it, should be mobilized, France and Russia, at the first news of this event and without previous agreement being necessary, shall mobilize immediately and simultaneously the whole of their forces, and shall transport them as far as possible to their frontiers.
Article 3. The available forces to be employed against Germany shall be, on the part of France, 1,300,000 men, on the part of Russia, 700,000 or 800,000 men.
Article 4
The general staffs of the armies of both countries will concert their efforts in good time to prepare and advance the execution of the measures set out above. They will exchange in peace time any information which comes to their knowledge of the armies of the Triple Alliance. Means and methods of communication will be studied and prepared in advance.
These forces shall engage to the full with such speed that Germany will have to fight simultaneously on the East and on the West.
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Prewar planning, when the above was discussed
The source is the "Documents Diplomatiques Français", 1871-1914, 3 ième Série, 1911-1914,Vol VIII (Paris 1935) No. 79.
Minutes of the Discussions In August 1913 between the Russian and French General Staffs.
(and including the full text, with the contemporaneous commentary, or in French "observations", which is in quotation marks.)
In application of para 1, Article 4 of the Military Convention of 17.8.1892, Generals Jilinski, head of the Russian General Staff, and General Joffre, head of French ditto, held several meetings at St Petersburg and Tsarskoe Selo during August 1913.
Also present were Gen. Laguiche, Military Attaché to Russia, Colonel Count Ignatieff, ditto to France, Colonel Berthelot, French Army.
It was agreed that if any changes were made to the previous Convention, the text should be reprinted in full but noting the changes in the text .
(Each article of the text of the Convention is followed by the corresponding commentary)
Text of the Convention.
Preamble
France and Russia, being animated by an equal desire to keep the peace and whose only object is to meet the needs of a defensive war, provoked by an attack of the forces of the Triple Alliance on one or the other, have agreed as follows:
"The two chiefs of the general staffs declared by common agreement that the words "defensive war" do not mean a war conducted defensively. They assert the contrary, that it is absolutely necessary for the French and Russian armies to take vigorous offensives and as far as possible simultaneously, according to the text of Article 3 of the Convention."
...
Article 2
"Same observations as in 1910, 1911 and 1912 but since their parent governments have approved the interpretation of the two chiefs of general staff, it is convenient to set them out as follows. The French and Russian governments having agreed in 1911 and 1912 that German mobilization would oblige Russia and France to mobilize immediately and simultaneously all their forces at the first news of the event and without previous consultation, it would be the same for any act of war by Germany against one or other of the allies. But if Austria or Italy should mobilize partially or even generally, that consultation is indispensable
The underlined phrase has been included to cover the possibility of a sudden attack, before mobilization, to seize some important point."
Article 3
"We still think Germany will direct the major part of her forces against France, leaving only a minimum against Russia. The 1913 Army Law in Germany will have the effect of speeding up mobilization. Thus the Germans can operate longer against France before having to turn to face Russia. Hence the aim of France and Russia attacking simultaneously from both sides. Joffre declared that the French forces will exceed the stated number by two hundred thousand, that most will be on the eastern frontier by the tenth day of mobilization and that operations will begin on the eleventh day, in the morning. Jilinsky declared that his forces would equal or exceed the number stated, that most would be on the frontier by the fifteenth day of mobilization and that operations would immediately follow. By the end of 1914, mobilization would be two days quicker. The conference discussed the main lines of their planned operations and the need for concentration of force. If the German forces in the east are mostly on the left bank of the Vistula then the Russians should bypass East Prussia to the south and head directly to Berlin otherwise to attack the German forces in that province."
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How things worked out
July 25 Tsar starts secret Mobilization of over 1 million men
July 30 Public notice of Russian Mobilization announced countrywide
July 31, 1914 Germany demands that Russia stop Mobilization within 24 hours and declares martial law, and closes Border with France and Belgium.
When the Russians did not answer that Ultimatum, Germany DoWs on Russia at 5pm on August 1st
August 2nd, Russia DoW on Germany in the Afternoon, and Russian Patrols move into German Territory, while in the West, Germany occupies Luxembourg
August 3 Germany DoW on France
Going from the 'Conversation' on Article 3, _Operations_ would commence on the 11th and 15th Day after Mobilization, Operations would occur, and from the Conversation on the Preamble--
absolutely necessary for the French and Russian armies to take vigorous offensives