For almost a week the battle raged furiously back and forth along this section of the front. On the 15th the Bulgarian lines opposed to the Serbians suddenly gave way and broke, and the triumphant Serbs made a rapid advance, pursuing the enemy for nine miles and capturing twenty-five cannon and many prisoners, according to dispatches of Entente origin. For the next thirty-six hours the fighting was intense, and then the whole Bulgarian right wing seemed to crumple and swing backward. For a while the Bulgarians made a stand on the banks of the Cerna, at the southern bend of the great loop made by the river, but finally the Serbians effected a crossing and continued driving the Bulgarians up along the ridges forming the eastern side of the Monastir Valley. Farther to the left the French and Russians were also succeeding in their efforts. The Bulgarians were driven out of and beyond Florina (Lerin in Bulgarian dispatches) and General Cordonnier, in command of the French, immediately established his headquarters at this important point, commanding the whole Monastir plain. Up this level country the Bulgarians fled. Reports did not indicate to just what point up the valley the French were able to advance, but it was quite obvious that the Bulgarians were able to stay them some distance before Monastir, where the mountains approach the city and offer excellent positions for artillery against troops advancing up the railroad line toward the city. On the map at least this important city seemed to be threatened, but it was still too premature to pronounce it in serious danger, as did the Entente press. CHAPTER XXXVII THE GREEKS ON THE FIRING LINE