began to withdraw at 7 p.m., towards their second defensive line at Hani 739, under the cover of the night. Upon reaching their second defensive line, the Ottomans became aware of the 4th Division's seizure of Porta Pass, panic spread in their ranks and many soldiers began fleeing and abandoning their equipment. On the morning of 10 October, the 4th Division charged down the northern slope of the Rahovo Mountain, surprising the Ottoman infantry and artillerymen who engaged in a disorganized retreat. At 4 p.m. on 10 October, the 4th Division marched into Servia, while the Greek cavalry entered Kozani unopposed the following day. On 13 October, the Greek army transferred its general headquarters to Kozani; a day later King George I arrived in the city, ordering the army to march towards Thessaloniki and Veroia. The Ottomans fought a number of small scale delaying actions at Kolokouri, Tripotamos and Perdika, the Greek army nevertheless continued its advance taking Veroia and Katerini on 16 October. Between 17 and 18 October, the Greek general command forwarded its troops to the Veroia-Naousa plain. After their defeat at Sarandaporo, the Ottomans augmented the remnants of Hasan Tahsin Pasha's force with fresh reinforcements. Two divisions from east Macedonia, one reserve division from Asia Minor and one reserve division from Thessaloniki; bringing the total Ottoman forces in the area to 25,000 men and 36 artillery pieces. The Ottomans chose to organize their main defensive line at Yenidje either because of the town's religious importance for Macedonia's Muslim population or because they did not wish to fight too close to Thessaloniki. The Ottomans dug their trenches at a high hill which overlooked the plain west of the town. The hill was surrounded by two rough streams, its southern approaches were covered by the swampy Giannitsa Lake while the slopes of Mount Paiko complicated any potential enveloping maneuver from the north. On the eastern approaches to Yenidje, the Ottomans reinforced the garrisons guarding the bridges across the Loudias River, the rail line at Platy and Gida. On 18 October, the Greek general command ordered its troops forward despite receiving conflicting intelligence reports regarding the disposition of the enemy troops. The 2nd and 3rd Greek Divisions marched along the same route towards Tsaousli and Tsekre respectively, both located north-east of Yenidje. The 1st Greek Division acted as the army's rearguard. The 4th Division headed towards Yenidje from the north-west,