From a purely military point of view, it seems hard to believe that the Bulgarians really thought that their night attack would bring about war. Their army had borne the brunt of the campaign against the Turks, and had suffered terribly during the winter spent in the trenches before Tchatalja. They were not in a good strategic position, for the army was spread out over a long line, and the character of the country made concentration difficult. Adequate railway communication with the bases of supplies was lacking. The Greeks and Servians, on the other hand, held not only the railway from Salonika to Nish through the valley of the Vardar, but even were it successfully cut, had communication by railway with their bases at Salonika, Monastir, Mitrovitza, Uskub, and Nish.

General Ivanoff, in command of the second Bulgarian army, was charged with confronting the whole of the Greek forces, in a line passing from the Ægean Sea to Demir-Hissar on the Vardar, between Serres and Salonika. When we realize that General Ivanoff had less than fifty thousand men, a portion of whom were recruits from the region of Serres, and that he had to guard against an attack on his right flank from the Servians, we cannot help wondering what the Bulgarian general staff had counted upon in provoking their allies to battle. Did they expect that the Greeks and Servians would be intimidated by the night attack of June 29th, and would agree to continue the project of a conference at Petrograd? Or did they think that the Greek army was of so little value that they could brush it aside, and enter Salonika, just as the Greeks had been able to enter in November? Whatever hypothesis we adopt, it shows contempt for their opponents and belief in their own star. The proof of the fact that the Bulgarians never dreamed of anything but the success of their "bluff," or, if there was resistance, of an easy victory, is found in the few troops at the disposal of General Ivanoff, and in the choice of Doiran, so near the front of battle, as the base of supplies. At Doiran everything that the second army needed in provisions and munitions of war was stored. From the financial standpoint alone, Bulgaria could not afford to risk the loss of these supplies.

On July 2d, the Greek army, under the command of Crown Prince Constantine, took the offensive against the Bulgarians, who had occupied on the previous day the crest of Beshikdag, from the mouth of the Struma to the plateau of Lahana, across the road from Salonika to Serres, and the heights north of Lake Ardzan, commanding the left bank of the Vardar. The positions were strong. If the Greek army had been of the calibre that the Bulgarians evidently expected, or if General Ivanoff had had sufficient forces to hold the positions against the Greek attack, there would undoubtedly have been pourparlers, and a probable cessation of hostilities just as the Bulgarians counted upon.

But the Greeks soon proved that they were as brave and as determined as their opponents. Their artillery fire was excellent. There was no wavering before the deadly resistance of the entrenched Bulgarians. After five days of struggle, in which both sides showed equal courage, the forces of General Ivanoff yielded to superior numbers. The Bulgarians were compelled to retreat, on July 6th, in two columns, towards Demir-Hissar and Strumitza. The retreat was effected in good order, and the Greeks, though in possession of mobile artillery, could not surround either column. Victory had been purchased at a terrible price. The Greek losses in five days were greater than during the whole war with Turkey. They admitted ten thousand hors du combat. The Greeks had received their first serious baptism of fire, and had demonstrated that they could fight. The Turks had never given them the opportunity to wipe out the disgrace of 1897.

It is a tribute to the quickness of decision of the Crown Prince Constantine and his general staff, and to the spirit of his soldiers, that this severe trial of five days of continuous fighting and fearful loss of life was not followed by a respite. The Greek headquarters were moved to Doiran on the 7th. It was decided to maintain the offensive as long as the army had strength to march and men to fill the gaps made by the fall of thousands every day. The Bulgarians, although they contested desperately every step, were kept on the move. On the right, the Greeks pushed through to Serres, joining there, on July 11th, the advance-guard of the detachments which the Greek fleet had landed at Kavalla on the 9th.

The advance of the Greek armies was along the Vardar, the Struma, and the Mesta. On the Vardar, the Bulgarian abandonment of Demir-Hissar, on the 10th, enabled the Greeks to repair the railway, and establish communication with the Servian army. The right wing, advancing by the Mesta, occupied Drama. On July 19th, the Bulgarian resistance was concentrated at Nevrokop. When it broke here, the Greek right wing was able to send its outposts to the foothills of the Rhodope Mountains, on the Bulgarian frontier.

The Greeks began to speak of the invasion of Bulgaria, and of making peace at Sofia. But the bulk of their forces met an invincible resistance at Simitli. From the 23d to the 26th, they attacked the Bulgarian positions, and believed that the advantage was theirs. But on the 27th the Bulgarians began a counter-attack against both wings of the Greek army at once. On the 29th, the Greeks began to plan their retreat. On the 30th, they realized that the retreat was no longer possible. The Bulgarians were on both their flanks. It was then that the armistice saved them.

While the Greek army was gaining its victories in the hinterland of Macedonia, the ports of the Ægean coast, Kavalla, Makri, Porto-Lagos, and Dedeagatch were occupied without resistance by the Greek fleet. Detachments withdrawn from Epirus were brought to these ports. Some went to Serres and Drama. Others garrisoned the ports, and occupied Xanthi and other nearby inland towns.

The Bulgarians may have had some reason to discount the value of the Greek army. For it had not yet been tried. But the Servians had shown from the very first day of the war with Turkey that they possessed high military qualities. The courage of their troops was coupled with agility. They had had more experience than the Bulgarians and Greeks in quick marches, and in breaking up their forces into numerous columns. There is probably no army in Europe to-day which can equal the Servians in mobility. It is incredible that the Bulgarians could have hoped to surprise the Servians, and find a weak place anywhere along their lines. On the defensive, in localities which they had come to know intimately by nine months in the field, it would have taken a larger force than the Bulgarians could muster to get the better of soldiers such as the Servians had proved themselves to be.