The Battle of Monastir was a failed French attack against German-Bulgarian fortifications North and West of Monastir, between March 12 and May 26, 1917 during the Salonika Campaign in World War I. The battle consisted of a series of operations and is known by several names. In French it is known as Bataille de la cote 1248 and Bataille de Pelister after the Pelister mountain. In Bulgarian it is known as the Battle of Chervena Stena, after the Chervena Stena or Crvena Stena ridge, also in the Pelister mountain range. This could be translated as the Battle of the Red Wall, but that name was not used in French or English. Another name for the engagement is the Battle of Lake Prespa.
Sarrail's plan was to attack the German and Bulgarian line between the Lakes Ohrid and Prespa and to also launch a frontal attack North from Monastir against Hill 1248. On March 11, the operations between the two lakes began with an intense bombardment and an attack by the 76th French Division against the Crvena Stena west of Monastir, where they captured some strong entrenchments around the villages of Dihovo, Tirnova and Snegovo. But resistance from Central Powers forces proved more vigorous than expected, and together with the extremely bad weather, this caused the attack to fail. The French attack on Hill 1248, which was to have been delivered at the same time, did not commence until the 14th. On the 18th, after four days of intense engagements, the French captured the whole of Hill 1248 as well as the fortified village of Krklino, taking 1,200 prisoners. But the Central Powers succeeded, by a counter-attack, in recapturing part of Hill 1248, whose summit remained abandoned by both sides. Monastir was somewhat relieved, but the town continued to remain under fire until the Armistice, when more than half of it had been destroyed by the 20,700 shells dropped on the town proper. Some 500 inhabitants were killed and 650 injured. The Chervena Stena was also retaken by the Bulgarians on 18 May.
Consequences
This French defeat meant that the whole spring offensive of 1917 left the allies with no results at all. For the Bulgarians this victory was a great boost in moral and there were even comparisons made with the historic victory in the Battle of Shipka Pass against the Turks in 1877. It was only 15 months later that the allies succeeded in breaking through the Bulgarian-German defenses in the Battle of Dobro Pole. This forced the capitulation of Bulgaria, thus decidedly turning the strategic and operational balance of the war against the Central Powers.