The secret clauses authorized the Allies to make use of the railways, roads, and other means of communication and transport in Bulgaria for the movement of their troops and to occupy certain strategic points. Sofia was not to be occupied save in exceptional circumstances.[46] At 22.30 hours on September 29th the Armistice was concluded. It was signed by General Franchet d’Espérey for the Allies and by the Finance Minister, Liapcheff, and General Lukoff for Bulgaria; it came into force on September 30th at noon. On September 30th the number of prisoners captured by the Allies was not very great, about 15,000 to 20,000 (those opposite the 35th Division did not surrender, as we know, until a few days later). But the Bulgarians had lost about one-third of their artillery; 350 guns had been captured, and many others, which had been abandoned or hidden in the woods and gullies, were found subsequently, and the ammunition dumps had been blown up. The causes of the Allied victory may be summed up as follows: 1. The great military qualities of General Franchet d’Espérey should be recognized; his able dispositions, based partly on the old plan of Voivod Michich, afterwards elaborated by General Guillaumat, consisted in the concentration in the Moglena sector of a mobile reserve for attack, created even at the cost of withdrawing troops from other areas and leaving them weakly defended. The Moglena sector had been chosen because, as it presented the greatest natural difficulties, the Bulgarians had taken less trouble over its artificial defences. In view of the great scarcity of Allied reserves, those that were available had to be transported from one area to the other according to necessity. This was done in the case of the 122nd French Division and the heavy artillery; as soon as a breach had been made they were transferred to the sector of the A.F.O., but as a matter of fact there was no need of the 122nd Division, because the A.F.O. was able to act on its own account; the division therefore went into army reserve.