The Hungarian Defence Forces is the national defence force of Hungary. Since 2007, the Hungarian Armed Forces is under a unified command structure. The Ministry of Defence maintains the political and civil control over the army. A subordinate Joint Forces Command is coordinating and commanding the HDF corps. In 2020, the armed forces had 22,700 personnel on active duty. In 2019, military spending was $1.904 billion, about 1.22% of the country's GDP, well below the NATO target of 2%. In 2016, the government adopted a resolution in which it pledged to increase defence spending to 2.0% of GDP and the number of active personnel to 37,650 by 2026.

The Battle of Segesvár, also called the Battle of Fehéregyháza, was a battle in the Hungarian Revolution of 1848, fought on 31 July 1849 between the Hungarian revolutionary army under the command of Lieutenant General Józef Bem and the Russian V Corps under General Alexander von Lüders. The battle ended with the victory of the Russian army, which was presumably the death location of the Hungarian poet and national hero Sándor Petőfi, but his body was never found. Furthermore, The Chief of Staff Russian V corps, General Grigory Skariatin was killed at the battle. Although heavy, the defeat was not decisive for the Hungarian army of Transylvania, Lieutenant General Józef Bem continuing his resistance in the province until the Battle of Nagycsűr on 6 August 1849.