At 4 p.m. on 10 October, the 4th Division marched into Servia,^[10] while the Greek cavalry entered Kozani unopposed the following day.^[11] After their defeat at Sarantaporo, the Ottomans augmented the remnants of Hasan Tahsin Pasha's force with fresh reinforcements^[12] and organized their main defensive line at Yenidje (Giannitsa). On 18 October, Crown Prince Constantine ordered the bulk of the Army of Thessaly to head towards Yenidje despite receiving conflicting intelligence reports regarding the disposition of the enemy troops.^[13] In the meantime, the 5th Greek Division under Dimitrios Matthaiopoulos, continued its advance across western Macedonia, aiming to reach the Kailaria (Ptolemaida)-Perdika area, where it was to await further orders. There, the division would either unite with the rest of the Army of Thessaly or capture Monastir (Bitola). After crossing the Kirli Derven pass, it reached Banitsa (Vevi) on 19 October.^[14]

The 5th Greek Division continued its march through the Florina plain on 19 October, halting temporarily north of Kleidi Pass (Kirli Derven) after learning that the Ottomans were massing their troops at Florina, Armenochori and Neochori. The following day a Greek advanced guard repulsed an attack by a small Ottoman unit at Flampouro. On 21 October, Matthaiopoulos ordered an advance towards Monastir after being informed that it was guarded by a small demoralized garrison. This decision was further encouraged by the Serbian victory at Prilep and the Greek victory at Yenidje.^[15]

The Battle of Sorovich took place between 21–24 October 1912. It was fought between Greek and Ottoman forces during the First Balkan War, and revolved around the Sorovich (Amyntaio) area. The 5th Greek Division which had been advancing through western Macedonia separately from the bulk of the Greek Army of Thessaly, was attacked outside the village of Lofoi and fell back to Sorovich. It found itself to be heavily outnumbered by an opposing Ottoman force.

After withstanding repeated attacks between 22 and 23 October, the division was routed on the early morning of 24 October after Ottoman machine gunners struck its flank in an early morning surprise attack. The Greek defeat at Sorovich resulted in the Serbian capture of the contested city of Monastir (Bitola).