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Bulgarians against Ottomans.
Operation Catalca (17.-18.11.1912).
After the defeats at Kirklareli and Lüleburgaz-Pinarhisar and the Bulgarian boycott of the negotiations, the Ottomans took steps to avert disaster. Three new corps were transferred from the rear to the so-called Catalca defense line. In addition, three corps were raised from the rest of the defeated armies: by early November, the Ottoman forces in eastern Thrace numbered six corps and 17 divisions with a total of 190,000 men and 350 guns.
Their objective was to stop the advance of the Bulgarians on Constantinople, taking advantage of the terrain and the fortifications. For this purpose, preparations were made for naval landings across the Black Sea and the Sea of Marmara in the rear of the advancing troops.
For their part, the Bulgarians, after a 120 km march, prepared according to their plan of operations to quickly break through the enemy defenses, push the enemy in a decisive attack against their right flank towards the Sea of Marmara and annihilate them. The main advance would come from the left flank of the 3rd Army (3rd and 5th Infantry Divisions) in the direction of Lasarköj Fortress.
The second supporting offensive was to come from the flanks of the 1st and 3rd Army (6th and 9th Infantry Divisions) against the center of the Catalca position in the direction of Ezettin-Nakasköj. In addition, a newly formed division was sent to the Adrianople area. The Bulgarian forces numbered eight divisions (including the 1st Cavalry Division) with 118,000 men and 462 artillery pieces. The infantry ratio was 1.6:1 in favor of the Ottomans and the artillery ratio 1.3:1 in favor of the Bulgarians.
The fighting at Catalca lasted only two days before the Bulgarians fell back to their starting positions, mainly due to the failure of their artillery, and suffered heavy losses. In an unfavorable situation, they ended the operation, as taking the Ottoman positions would have cost too many casualties. Result and assessment:
Losses:
a) Bulgarians: 1,480 dead, 13,000 wounded, 1,400 missing, 1,600 dead from wounds;
b) Ottomans: 3,500 dead and more than 22,000 wounded.
The Ottomans found a foothold behind the fortifications of the Catalca position in defense of Constantinople. This position would acquire decisive importance and would become the center of events until the conclusion of the armistice at the beginning of December 1912. The Catalca Defense Line, drawn between 1877 and 1879, extended 25 km in the narrowest part of the Constantinople Peninsula between Büyük-Cekmece (to the south, on the Sea of Marmara) and Lake Derkos (to the north, on the Black Sea). A ridge served as a defensive position, stretching from Karaburun on the Black Sea through Derkos - Delijunus - Kurukavak - Akbunar - Mahmud-Pasha to the northern end of Lake Büyük-Cekmece. Opposite this line flowed the Karasu and Lazarksy rivers. This was a system of 29 fortresses located 40 km from the Bosphorus. In between were infantry positions, batteries and machine gun positions.
Source: Bulgarian Gegen Osmanen. Militärgeografische Bedeutung Südosteuropas im Ersten Balkankrieg. Paul Meinrad Strassle. ÖMZ 5/2008.
Cheers. Raúl M

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