At Salonika the Allies’ politically ambitious but militarily ineffective commander in chief, General Sarrail, was replaced at the end of 1917 by General Guillaumat, who was in turn succeeded in July 1918 by General L.-F.-F. Franchet d’Esperey, who launched a major offensive in September with six Serbian and two French divisions against a seven-mile front held by only one Bulgarian division.

The initial assault, preceded by heavy bombardment at night, began in the morning of September 15, 1918, and a five-mile penetration was achieved by nightfall on September 16. The next day the Serbs advanced 20 miles forward, while French and Greek forces on their flanks widened the breach to 25 miles. A British attack, launched on September 18 on the front between the Vardar and Lake Doiran, prevented the Bulgars from transferring troops westward against the right flank of the penetration; and by September 19 the Serbian cavalry had reached Kavadarci, at the apex of the Crna–Vardar triangle. Two days later the whole Bulgarian front west of the Vardar had collapsed.

While Italian forces in the extreme west advanced on Prilep, the elated Serbs, with the French beside them, pressed on up the Vardar Valley. The British in the east now made such headway as to take Strumica, across the old Bulgarian frontier, on September 26. The Bulgars then sued for an armistice; and on September 29, when a bold French cavalry thrust up the Vardar from Veles (Titov Veles) took Skopje, key to the whole system of communications for the Balkan front, Bulgarian delegates signed the Armistice of Salonika, accepting the Allies’ terms unreservedly.

The Turkish fronts, 1918

The British–Turkish front in Palestine in the summer of 1918 ran from the Jordan River westward north of Jericho and Lydda to the Mediterranean just north of Jaffa. North of this front there were three Turkish “armies” (in fact, barely stronger than divisions): one to the east of the Jordan, two to the west. These armies depended for their supplies on the Hejaz Railway, the main line of which ran from Damascus southward, east of the Jordan, and which was joined at Déraa (Darʿā) by a branch line serving Palestine.

Liman von Sanders, Falkenhayn’s successor as commander of the Turkish forces in Syria–Palestine, was convinced that the British would make their main effort east of the Jordan. Allenby, however, was really interested in taking a straight northerly direction, reckoning that the Palestine branch rail line at ʿAfula and Beisān, some 60 miles behind the Turkish front, could be reached by a strategic “bound” of his cavalry and that their fall would isolate the two Turkish armies in the west.

Having by ruse and diversion induced the Turks to reduce their strength in the west, Allenby struck there on September 19, 1918, with a numerical superiority of 10 to one. In this Battle of Megiddo, a British infantry attack swept the astonished defenders aside and opened the way for the cavalry, which rode 30 miles north up the coastal corridor before swinging inland to cut the Turks’ northward lines of retreat. ʿAfula, Beisān, and even Nazareth, farther north, were in British hands the next day.

When the Turks east of the Jordan River began to retreat on September 22, the Arabs had already severed the railway line and were lying in wait for them; and a British cavalry division from Beisān was also about to push eastward to intercept their withdrawal. Simultaneously, two more British divisions and another force of Arabs were racing on toward Damascus, which fell on October 1. The campaign ended with the capture of Aleppo and the junction of the Baghdad Railway. In 38 days Allenby’s forces had advanced 350 miles and taken 75,000 prisoners at a cost of less than 5,000 casualties.

In Mesopotamia, meanwhile, the British had taken Kifrī, north of the Diyālā left-bank tributary of the Tigris, in January 1918, and Khān al-Baghdāẖī, up the Euphrates, in March. Pressing northward from Kifrī, they took Kirkūk in May but soon evacuated it.

The British centre in Mesopotamia, advancing up the Tigris in October, was about to capture Mosul when the hostilities were suspended. The Ottoman government, seeing eastern Turkey defenseless and fearing an Allied advance against Istanbul from the west now that Bulgaria had collapsed, decided to capitulate. On October 30 the Armistice of Mudros was signed, on a British cruiser off Lemnos. The Turks, by its terms, were to open the Straits to the Allies; demobilize their forces; allow the Allies to occupy any strategic point that they might require and to use all Turkey’s ports and railways; and order the surrender of their remaining garrisons in Arabia, Syria, and Mesopotamia. The centuries-old Ottoman Empire had come to an end.