The Battle of Kumanovo, on 23–24 October 1912, was a major battle of the First Balkan War. It was an important Serbian victory over the Ottoman army in the Kosovo Vilayet, shortly after the outbreak of the war.

The siege of Scutari, also referred to as the siege of Shkodër, known in Turkish as İşkodra Müdafaası (in Turkish) or İşkodra Savunması, took place from 28 October 1912 to 23 April 1913 when the army of the Kingdom of Montenegro defeated the forces of the Ottoman Empire and captured Shkodër.

The Battle of Lule Burgas or Battle of Luleburgas – Bunarhisar took place between the Kingdom of Bulgaria and the Ottoman Empire and was the bloodiest battle of the First Balkan War. The battle took place from 28 October to 2 November 1912. The outnumbered Bulgarian forces made the Ottomans retreat to Çatalca line, 30 km from the Ottoman capital Constantinople. In terms of forces engaged it was the largest battle fought in Europe between the end of the Franco-Prussian War and the beginning of the First World War.

The Battle of Kirk Kilisse or Battle of Kirklareli or Battle of Lozengrad was part of the First Balkan War between the armies of Bulgaria and the Ottoman Empire. It took place on 22–24 October 1912. Bulgarian forces of the First and Third Armies defeated the Ottoman Eastern Army and captured Lozengrad. The victory forced the Ottoman forces to retreat toward the Lüleburgaz–Bunarhisar line and opened much of northern Thrace to the Bulgarians.

The Battle of Sarantaporo, also variously transliterated as Sarantaporon or Sarandaporon, took place on 9–10 October, 1912. It was the first major battle fought between Greek forces under Crown Prince Constantine and Ottoman forces under General Hasan Tahsin Pasha during the First Balkan War. The battle began when the Greek army attacked the Ottoman defensive line at the Sarantaporo pass, which connected Thessaly with central Macedonia.

The Battle of Kircaali or Battle of Kardzhali was part of the First Balkan War between the armies of Bulgaria and the Ottoman Empire. It took place on 21 October 1912, when the Bulgarian Haskovo Detachment defeated the Ottoman Kırcaali Detachment of Yaver Pasha and permanently joined Kardzhali and the Eastern Rhodopes to Bulgaria. The anniversary of that event is celebrated annually on 21 October as a holiday of the city.

The Battle of Pente Pigadia or Battle of Beshpinar, took place on 22–30 October (O.S.), 1912. It was fought between Greek forces under Lieutenant General Konstantinos Sapountzakis and Ottoman forces under General Esad Pasha during the First Balkan War. The battle began when the Ottomans attacked Greek positions at Anogi. Early snowfall prevented the Ottomans from launching a big offensive, while the Greeks managed to hold their ground for six days in the ensuing series of skirmishes.