From Katshanik to Krivolak the railroad was in Bulgarian hands. From Krivolak south to Doiran it was in the hands of the Allies, though parts of it were at times under the fire of the Bulgarian artillery. South of Katshanik the Bulgarians had crossed the road and had pushed westward until they were held up at the Babuna Pass. Should the pass be forced the Serbian line was in immediate danger of being flanked and the French, too, would be in a similar danger, for by striking south the Bulgarians could make a move around toward the French rear. Hence the almost superhuman efforts both Serbians and French were making to close this gap.
The stand that the Serbians made in Babuna Pass was one of those feats which will remain inscribed on the pages of history through the ages and will excite the admiration of all people, regardless of how their sympathies may lie toward the main issues of the war. During the first week of November Colonel Vassitch had only 5,000 men with which to dispute the right of way against 20,000 Bulgarians. And not only had the Bulgarians a great advantage in the matter of numbers, but they were well supplied with big guns. Day after day and night after night, the little force of Serbians crouched among the deep shadows of the defile, sometimes without food, always under a heavy fire, now and again making the rock cliffs about them echo with bursts of their plaintive, national folk songs. After November 4, 1915, the Bulgarian attacks became more persistent, and their infantry would hurl itself up into the pass; then the Serbians would spring up from behind rocks and ledges and throw themselves at their hated kinsmen with naked bayonets, shouting such words in their common language as send the flush of rage burning through the cheeks of men and make things red before their eyes. Again and again were these sanguinary hand-to-hand struggles enacted under the towering rock walls of those forbidding mountains, and again and again the Bulgarians were thrown back. Meanwhile, the French, only ten miles away, were within sound of the firing.
As a matter of fact, General Sarrail had already done wonders, considering the shortness of the time he had had and the small forces and few facilities at his disposal. It seemed, to those at a distance, such a small gap to fill. And indeed, so nearly did Sarrail effect the junction that nothing but the absence of reenforcements at a critical moment caused him to fail.
As soon as he had landed at Saloniki he had sent every soldier under his command along the railroad up the valley of Vardar, toward Veles. Unfortunately, transportation facilities were poor; the road was only single track; curving and twisting in and out among the rising foothills and mountain spurs.
His first fighting had been at Strumitza station, where he defeated the Bulgarians and so assured himself of possession of Demir Kapu defile, a cleft in the mountains ten miles in length and from which, had they held it, the Bulgarians could easily, with a comparatively small force, have prevented any further advance. Having secured this pass, Sarrail pushed through it to Krivolak, which was reached on October 19, 1915. But here he was compelled to make a halt, to fortify this advanced position and to await further reenforcements.
When news of the proximity of the French advance reached Vassitch, he redoubled his efforts, and on October 22, 1915, he thrust his little army forward and succeeded in recapturing Veles. This town lay along the railroad, about thirty-five miles northwest of Krivolak.
Three miles north of Krivolak, on the road to Ishtip, rises a steep and forbidding height, called Kara Hodjali (the Black Priest), which the French were fortunate enough to take before the Bulgarians came up in force. It was this height which enabled them, when the Bulgarians did swarm down on them, some days later, to hold their position. From October 30, 1915, until November 5, 1915, the fighting here was furious, but finally the Bulgarians were driven back. Meanwhile, however, the advance had been delayed and Vassitch, after holding Veles a week, was forced to retire to Babuna Pass again.
From Krivolak to the pass was twenty-five miles, due east. For fifteen miles the road lay across a rolling plain, to the River Tserna, as the Macedonians and Serbians called it, or Tcherna, meaning "Black," in Bulgarian. Beyond that rose steep and difficult mountain ridges, which the Bulgarians had occupied and fortified. Yet Sarrail determined to make an effort to force his way across.
By this time reenforcements had arrived from Saloniki, so he began moving across the plain through Negotin and Kavadar to the Tcherna. This stream, though narrow, was deep and unfordable. It could be crossed only in one place, by a small plank bridge, at Vozartzi.
On November 5, 1915, the French troops began crossing this bridge and scaling the heights before them, some of whose peaks towered fully a thousand feet above the river. And here it was that they first heard the booming of the Serbian guns, on the other side of the ridge.