On February 11 and 12th, the Deve-Boyun Ridge, an important artillery platform, was the scene of heavy fighting. North of the Deve Boyun ridge, the Russian columns approached over the Kargapazar ridge, which the Ottomans had considered impassable. The X Corps guarded that sector of the line, and its commander had positioned his divisions so that they could not support one another. Mahmut Kamil had five divisions in the Deve-Boyun ridge area but was slow to react to events north of that position.