They won the first encounters and forced Kasim Pasha of Rumelia and his co-commander Turakhan Beg to abandon their camp and flee to Sofia, Bulgaria to warn Murad of the invasion.

When they arrived in Sofia they advised the Sultan to burn the city and retreat to the mountain passes beyond, where the Ottoman's smaller army would not be at such a disadvantage.

As they in turn retreated they ambushed and defeated a pursuing force at the Battle of Kunovica, where Mahmud Bey, brother-in-law of the Sultan and brother of the Grand Vizier Çandarlı Halil Pasha, was taken prisoner.

[1] On 24 April 1444 Vladislaus sent a letter to Murad, stating that his ambassador, Stojka Gisdanić, was travelling to Edirne with full powers to negotiate on his behalf.

He asked that once an agreement was reached, Murad send his own ambassadors with the treaty and his sworn oath to Hungary, at which point Vladislaus could also swear peace.

[1] On the same day Vladislaus held a diet at Buda, where he swore before Cardinal Julian Cesarini to lead a new expedition against the Ottomans in the summer.

However, on 12 June 1444, after three days of discussion, the treaty was hastily completed because İbrahim II of Karaman had invaded Murad's lands in Anatolia.

[1] The final terms stated that Murad would return 24 Serbian cities, including the large fortresses of Golubac and Smederevo, to the exiled Branković.

A ten-year truce was established with Hungary, and Vlad II Dracul, Voivode of Wallachia, was no longer obliged to attend Murad's court, though he was still required to pay tribute.

[1] Once Murad had sworn an oath to observe the treaty, it was sent to Hungary with Baltaoğlu Süleyman and a Greek, Vranas, for ratification by Vladislaus, Hunyadi, and Branković.

By the time the King made his declaration word of the peace negotiations had spread, prompting additional pressure from pro-crusaders, including Despot Constantine Dragases, to renounce the treaty.

A letter written by Ciriaco Pizzicolli on 24 June 1444 begged Hunyadi to ignore the peace, stating the Turks were terrified "and preparing their army for retreat rather than battle".

[1] Shortly after Vladislaus' declaration, around the same time as writing the letter to Hunyadi, Ciriaco passed the news to the Pope, who in turn informed Cesarini.

With Hunyadi, the barons, and the prelates of the Kingdom of Hungary in attendance, Vladislaus solemnly agreed to "abjure any treaties, present or future, which he had made or was to make with the Sultan".

Shortly after the Karamanids' submission, therefore, Murad abdicated in favor of Mehmed II, his twelve-year-old son, intending to enjoy a peaceful retirement.

Hungary relapsed into civil war and the removal of the threat to the Ottoman's Balkan front allowed them to concentrate forces for the conquest of Constantinople (Istanbul) in 1453.