The long campaign was a military campaign

Military campaign

In the military sciences, the term military campaign applies to large scale, long duration, significant military strategy plan incorporating a series of inter-related military operations or battles forming a distinct part of a larger conflict often called a war...

 led by John Hunyadi

John Hunyadi

John Hunyadi John Hunyadi (Hungarian: Hunyadi János , Medieval Latin: Ioannes Corvinus or Ioannes de Hunyad, Romanian: Iancu (Ioan) de Hunedoara, Croatian: Janko Hunjadi, Serbian: Сибињанин Јанко / Sibinjanin Janko, Slovak: Ján Huňady) John Hunyadi (Hungarian: Hunyadi János , Medieval Latin: ...

 and young king Władysław III of Poland (Ulaszlo I of Hungary) across the Balkans

Balkans

The Balkans is a geopolitical and cultural region of southeastern Europe...

 against the Ottomans

Ottoman Empire

The Ottoman EmpireIt was usually referred to as the "Ottoman Empire", the "Turkish Empire", the "Ottoman Caliphate" or more commonly "Turkey" by its contemporaries...

 from July 22, 1443 to January 25, 1444.

The Christian

Christian

A Christian is a person who adheres to Christianity, an Abrahamic, monotheistic religion based on the life and teachings of Jesus of Nazareth as recorded in the Canonical gospels and the letters of the New Testament...

 army started at Buda

Buda

For detailed information see: History of Buda CastleBuda is the western part of the Hungarian capital Budapest on the west bank of the Danube. The name Buda takes its name from the name of Bleda the Hun ruler, whose name is also Buda in Hungarian.Buda comprises about one-third of Budapest's...

 including Hungarian, Polish, Czech, German infantry and cavalry, Lithuanian reinforcements, 3000 wagons. Later, 10,000 Wallachia

Wallachia

Wallachia or Walachia is a historical and geographical region of Romania. It is situated north of the Danube and south of the Southern Carpathians...

n and Serbians

Serbs

The Serbs are a South Slavic ethnic group of the Balkans and southern Central Europe. Serbs are located mainly in Serbia, Montenegro and Bosnia and Herzegovina, and form a sizable minority in Croatia, the Republic of Macedonia and Slovenia. Likewise, Serbs are an officially recognized minority in...

 joined, so the whole army was 35,000 men strong.

The first battle was at Krusevac

Kruševac

Kruševac is a city and municipality, and the administrative center of the Rasina District, in central Serbia. According to the 2011 census, the municipality has a population of 127,429, while the town has 57,627....

, and Ottomans were defeated by the Hungarians.
Hunyadi, at the head of the vanguard, crossed the Balkans

Balkans

The Balkans is a geopolitical and cultural region of southeastern Europe...

 through the Gate of Trajan

Gate of Trajan

The Gate of Trajan or Trajan's Gate is a historic mountain pass near Ihtiman, Bulgaria. It was named so after Roman Emperor Trajan, on whose order a fortress by the name of Stipon was constructed on the hill over the pass, as a symbolic border between the provinces of Thrace and Macedonia.The pass...

, captured Niš

Niš

Niš is the largest city of southern Serbia and third-largest city in Serbia . According to the data from 2011, the city of Niš has a population of 177,972 inhabitants, while the city municipality has a population of 257,867. The city covers an area of about 597 km2, including the urban area,...

, defeated three Turkish pasha

Pasha

Pasha or pascha, formerly bashaw, was a high rank in the Ottoman Empire political system, typically granted to governors, generals and dignitaries. As an honorary title, Pasha, in one of its various ranks, is equivalent to the British title of Lord, and was also one of the highest titles in...

s, and, after taking Sofia

Sofia

Sofia is the capital and largest city of Bulgaria and the 12th largest city in the European Union with a population of 1.27 million people. It is located in western Bulgaria, at the foot of Mount Vitosha and approximately at the centre of the Balkan Peninsula.Prehistoric settlements were excavated...

, united with the royal army and defeated Sultan

Ottoman Dynasty

The Ottoman Dynasty ruled the Ottoman Empire from 1299 to 1922, beginning with Osman I , though the dynasty was not proclaimed until Orhan Bey declared himself sultan...

 Murad II

Murad II

Murad II Kodja was the Sultan of the Ottoman Empire from 1421 to 1451 ....

 at Snaim. The impatience of the king and the severity of the winter then compelled him to return home, but not before he had utterly broken the Sultan's power in Bosnia

Bosnia (region)

Bosnia is a eponomous region of Bosnia and Herzegovina. It lies mainly in the Dinaric Alps, ranging to the southern borders of the Pannonian plain, with the rivers Sava and Drina marking its northern and eastern borders. The other eponomous region, the southern, other half of the country is...

, Herzegovina

Herzegovina

Herzegovina is the southern region of Bosnia and Herzegovina. While there is no official border distinguishing it from the Bosnian region, it is generally accepted that the borders of the region are Croatia to the west, Montenegro to the south, the canton boundaries of the Herzegovina-Neretva...

, Serbia, Bulgaria

Bulgaria

Bulgaria , officially the Republic of Bulgaria , is a parliamentary democracy within a unitary constitutional republic in Southeast Europe. The country borders Romania to the north, Serbia and Macedonia to the west, Greece and Turkey to the south, as well as the Black Sea to the east...

, and Albania

Albania

Albania , officially known as the Republic of Albania , is a country in Southeastern Europe, in the Balkans region. It is bordered by Montenegro to the northwest, Kosovo to the northeast, the Republic of Macedonia to the east and Greece to the south and southeast. It has a coast on the Adriatic Sea...

.