Early in August Sarrail, who was now commander-in-chief, ordered a French attack on Doiran, and Doldjeli was taken. Probably this was no more than a feint, for the real design was farther west, where the Serbians under Prince Alexander were looking forward to Monastir. Their offensive was anticipated by the Bulgars, who after some pourparlers with Rumania, were induced or constrained by their German masters to attack on the 17th. In the west Florina and Banitza were seized on Greek territory, and on the east the whole of new Greece, including Seres, Kavalla, and Demirhissar, as far as the Struma; the Greek garrisons surrendered and were sent to Germany as the Kaiser's guests (see Map, p. 151).
This was the last straw for the better part of Greece. Venizelos addressed a mass meeting of protest at Athens on the 27th, and on the 30th a revolution broke out at Salonika under Colonel Zimbrakakis, the Venizelist deputy for Seres. Regiments were enrolled for service against Bulgaria, and one of them set out for the front on 22 September. On the 24th a similar movement swept over Crete; Mytilene, Samos, and Chios and smaller Greek islands followed suit; and Venizelos left Athens to form with Admiral Condouriotes and General Danglis a provisional government of insurgent Greece at Salonika. It was grudgingly recognized by the Entente and at once declared war on Bulgaria. The mainland, south-west of Salonika, however, remained under Constantine's control, and added to its hostility to the Entente a murderous vendetta against the Venizelists. The militarist party engaged in the curious campaign of forming leagues of reservists to oppose a war which would involve their call to the colours, and a succession of embarrassed phantoms was established in office to enable the king to evade the demands of the Allies. They increased in severity from the surrender of the fleet to that of the army's batteries and then to its disbandment; but they were backed by inadequate force and bungling diplomacy. On 1 December detachments of Allied troops, landed at the Piraeus, were driven back with bloodshed, and well into the new year the King continued to defy the Entente and push Greece deeper into anarchy. On its side the Entente wished to avoid a civil war, which would be almost worse than united enmity, because it would preclude a naval blockade; but the principal cause of its blunders was its own divided counsels. France and Great Britain were stoutly Venizelist; but the Tsar had personal reasons for dreading revolutions, particularly one against his cousin, and Italy had no liking for that greater Greece which was represented by Venizelos, might become a rival in the eastern Mediterranean, and would certainly reclaim the Dodecanese from its Italian masters.