Slovak–Hungarian War

After the Munich Pact, which weakened Czech lands to the west, Hungarian forces remained poised threateningly on the Slovak border. They reportedly had artillery ammunition for only 36 hours of operations and were clearly engaged in a bluff but had been encouraged by Germany, which would have had to support it militarily if the much larger and better equipped Czechoslovak Army had chosen to fight. The Czechoslovak army had built 2,000 small concrete emplacements along the border wherever there was no major river obstacle.

In mid-1938, his ministry armed the Rongyos Gárda ("Ragged Guard"), which began to infiltrate into southern Slovakia and Carpatho-Ukraine. The situation was now verging on open war. From the German and the Italian points of view, this would be premature and so they pressured the Czechoslovak government to accept their joint Arbitration of Vienna. On 2 November 1938, it found largely in favour of Hungary and obliged Czechoslovakia to cede to Hungary 11,833 km² of the south part of Slovakia, which was mostly Hungarian-populated (according to the 1910 census^[2]). The partition also cost Košice, Slovakia's second largest city, and left the capital, Bratislava, vulnerable to further Hungarian pressure.

The First Vienna Award did not fully satisfy Hungary, which carried out 22 border clashes between 2 November 1938 and 12 January 1939.

In March 1939, a new crisis hit the political scene in Czechoslovakia. President Emil Hácha dismissed the Slovak government of Jozef Tiso and appointed a new Slovak prime minister, Karol Sidor. Slovakia declared independence and requested that Germany provide protection from Hungary, whose forces were, Ribbentrop stated, gathering on the border, take even more land. On the evening of 13 March 1939, Tiso and Ferdinand Ďurčanský met Hitler, Ribbentrop and Generals Walther von Brauchitsch and Wilhelm Keitel in Berlin. Meanwhile, aware of the German position, Hungary was preparing for action on the adjacent Ruthenian border. During the afternoon and the night of 14 March, the Slovak Parliament proclaimed independence from Czechoslovakia. Hácha was invited to Berlin by Hitler on March 14, 1939. He was forced to until 1:30 AM of the next day, after which he was presented with two options. A union with Germany as a protectorate with nominal autonomy or war. Hácha first refused, but after the Nazis threatened to bomb Prague at 4 AM he suffered a heart attack. With medical staff next to him Hácha signed the document uniting what remained of Czechoslovakia with Germany forming the Protectorate of Bohemia and Moravia and informed Prague about his decision. He departed by train that day to Prague, but the train was slowed down on purpose by the Germans to make sure Hitler got to Prague before Hácha did.^[3]

Slovakia was surprised when Hungary recognized its new state as early as 15 March. However, Hungary was not satisfied with the border with Slovakia and, according to Slovak sources, weak elements of their 20th Infantry Regiment and frontier guard repulsed a Hungarian attempt to seize Hill 212.9 opposite Uzhhorod (Ungvár). In this and the subsequent shelling and bombing of the border villages of Nižné Nemecké and Vyšné Nemecké, Slovakia claimed to have suffered 13 dead and promptly petitioned Germany, invoking Hitler's promise of protection.

On 17 March, the Hungarian Foreign Ministry told Germany that Hungary wanted to negotiate with the Slovaks over the eastern Slovak boundary on the pretext that the existing line was only an internal Czechoslovak administrative division, not a recognized international boundary, and so needed defining now that Carpatho-Ukraine had passed to Hungary. It enclosed a map of their proposal that shifted the frontier about 10 km (6 mi) west of Uzhhorod, beyond Sobrance, and then ran almost due north to the Polish border.

The Hungarian claim partly relied on the 1910 census, which stated that Hungarians and Ruthenians, not Slovaks, formed the majority in northeastern Slovakia. In addition to the demographic issue, Hungary also had another purpose in mind: protecting Uzhhorod and the key railway to Poland up the Uzh River, which was within view of the current Slovak border. Therefore, it resolved to push the frontier back a safe distance beyond the western watershed of the Uzh Valley.

Germany let Hungary and Slovakia know that it would acquiesce to such a border revision. On 18 March, the Slovak leaders, in Vienna for the signing of the Treaty of Protection, were forced to accept that, and Bratislava ordered Slovak civil and military authorities to pull back. All other potential Hungarian requests were supposed to be illegal in Slovakia.

Hungary was aware that Slovakia had signed a treaty guaranteeing Slovakia's borders on 18 March and that it would come into force when Germany countersigned it. It, therefore, decided to act immediately to take advantage of the disorganized Slovak army, which had not yet fully consolidated. Thus, Hungarian forces in the western Carpatho-Ukraine began to advance from the River Uzh into eastern Slovakia at dawn on 23 March, some six hours before Ribbentrop countersigned the Treaty of Protection in Berlin.

• Slovak Order of battle
• Hungarian Order of battle
• Weapons employed in the Slovak–Hungarian War

At dawn on 23 March 1939, Hungary suddenly attacked Slovakia from Carpatho-Ukraine, with instructions being to "proceed as far to the west as possible"^{[citation needed]}. Hungary attacked Slovakia without any declaration of war, catching the Slovak army unprepared because many Slovak soldiers were in transit from the Czech region and had not yet reached their Slovak units. Czech soldiers were leaving the new Slovakia, but many of them decided to remain with their former units in Slovakia after the Hungarian attack.

In the north, opposite Stakčín, Major Matějka assembled an infantry battalion and two artillery batteries. In the south, around Michalovce, Štefan Haššík, a reserve officer and a local Slovak People's Party secretary, gathered a group of about four infantry battalions and several artillery batteries. Further west, in the Košice – Prešov front (on which Hungary maintained an infantry brigade,) Major Šivica assembled a third Slovak concentration. To the rear, a cavalry group and some tanks were thrown together at Martin, and artillery detachments readied at Banská Bystrica, Trenčin and Bratislava. However, German interference disrupted or paralysed their movement, especially in the V Corps. The Slovak defence was tied down, as the Hungarian annexations the previous autumn had transferred the only railway line to Michalovce and Humenné to Hungary, thereby delaying all Slovak reinforcements.

Hungarian troops advanced quickly into eastern Slovakia, which surprised both Slovakia and Germany. Despite the confusion caused by the hurried mobilization and the acute shortage of officers, the Slovak force in Michalovce had coalesced enough to attempt a counterattack by the next day. That was largely because of Czech Major Kubíček, who had taken over command from Haššik and begun to get a better grip on the situation. Because they were based on a widely available civilian truck, spares were soon found to repair five of the sabotaged OA vz. 30 armoured cars in Prešov, and they reached Michalovce at 05:30 on 24 March. Their Czech crews had been replaced by scratch teams of Slovak signallers from other technical armed forces. They were immediately sent to reconnoitre Budkovce, some 15 km (9 mi) south of Michalovce, but could not find any trace of the Hungarians.

The Slovaks decided to counterattack eastwards, where the most advanced Hungarian outpost was known to be some 10 km (6 mi) away at Závadka.^{[clarification needed]} The road-bound armoured cars engaged the Hungarian pocket from the front whilst Slovak infantry worked round their flanks. Soon, they forced the heavily outnumbered Hungarians to fall back from Závadka towards their main line on the River Okna/Akna, just in front of Nižná Rybnica.

The armoured cars continued down the road a little past Závadka whilst the Slovak infantry fanned out and began to deploy on a front of some 4 km (2.5 mi) on either side of them, between the villages of Úbrež and Vyšné Revištia. The infantry first came under Hungarian artillery fire during the occupation of Ubrež, north of the road. At 23:00 a general attack was launched on the main Hungarian line at Nižná Rybnica. The Hungarian response was fierce and effective. The Slovaks had advanced across open ground to within a kilometre of the Akna River when they began taking fire by Hungarian field and antitank artillery.

One armoured car was hit in the engine and had to be withdrawn, and a second was knocked out in the middle of the road by a 37mm anti-tank cannon. The raw infantry, unfamiliar with their new officers, first went to ground and then began to retreat, which soon turned into a panic that for some could not be stopped before Michalovce, 15 km (9.3 mi) to the rear. The armoured cars covered the retreating infantry with their machine guns to forestall any possible Hungarian pursuit.

Late on 24 March, four more OA vz.30 armoured cars and three LT vz.35 light tanks and a 37mm antitank cannon arrived in Michalovce from Martin to find total confusion. Early on 25 March they headed eastwards, sometimes steadying the retreating infantry by firing over their heads, thereby ensuring the reoccupation of everywhere up to the old Úbrež – Vyšné Revištia line, which the Hungarians had not occupied. However, the anti-tank section mistakenly drove past the knocked-out armoured car and ran straight into the Hungarian line, where it was captured.

By now, elements of the 41st Infantry Regiment and a battery of 202nd Mountain Artillery Regiment had begun to reach Michalovce, and Kubíček planned a major counterattack for noon, to be spearheaded by the newly arrived tanks and armoured cars. However, German pressure brought about a ceasefire before it could go in.

On 26 March, the rest of the 202nd Mountain Artillery Regiment and parts of the 7th and 17th Infantry Regiments began to arrive. There were now some 15,000 Slovak troops in and around Michalovc, but even with these reinforcements, a second counterattack had little better prospect of success than the first because the more numerous and cohesive Hungarians were well dug in and had more than enough 37 mm antitank cannons to deal effectively with the three modern light tanks that represented the only slight advantage possessed by the Slovaks.

After the division of Czechoslovakia, the six regiments of the former Czechoslovak Air Force were also divided. The core of this air force on Slovak territory was the 3rd Air Regiment of Milan Rastislav Štefánik, which came under the control of the Slovak Ministry of Defence. However, the officers, experienced pilots and aviation experts were mostly Czechs.

Before 14 March, the Slovak Air Force (Slovenské vzdušné zbrane) had about 1,400 members. After the division, Slovakia had only 824 left.^[4] Returning crews from occupied Protectorate of Bohemia and Moravia only slowly reinforced the nascent Slovak Air Force. The tactical situation was most critical in eastern Slovakia, at the airport of Spišská Nová Ves. The two fighter squadrons at that airport only had nine pilots, and there were only three officers at the airport headquarters. Also, the situation was becoming more and more critical as Hungarian attacks were increasing.^[4] Many pilots flying together were then from different parts of Slovakia and had no time to train together, which put them at a marked disadvantage against the prepared and complete Hungarian squadrons.

The best Slovak fighter plane of the time was the Czech Avia B-534.

Occupation of Spišská Nová Ves airport at 22 March 1939:^[4]

Other elements of the 3rd Air Regiment of Milan Rastislav Štefánik were at airfields in Vajnory, Piešťany, Nitra, Žilina and Tri Duby. However, a lack of pilots greatly hampered its effectiveness. Some crews from Piešťany and Žilina were sent to support Spišská Nová Ves. In that state, the Slovak Air Force had to support ground units in combat and interfere with Hungarian supplies. To do so, they had to fly low and, as they had no armour, become an easy target for Hungarian artillery or even ground unit soldiers.^{[clarification needed]}

Hungary concentrated its aerial assets on targets in eastern Slovakia:^[5]

The best plane in the Royal Hungarian Air Force was the Fiat CR.32 fighter. Its engine was less powerful than that of the Slovak-operated Avia and so Hungarian pilots tried to fight at horizontal levels, while the Slovaks tried to take the combat into the vertical plane. The Fiats could be handled better, especially if the Avias were flying with bombs under their wings, making them more clumsy. The Fiat CR.32 had better machine guns.

On 15 March, the Royal Hungarian Air Force did a thorough aerial reconnaissance of eastern Slovakia. The next day, Hungarian squadrons were moved to airfields closer to the borders of Slovakia and put on alert.

On the morning of 23 March, two Slovak patrol squadrons operating from Spišská Nová Ves searched for the enemy, but the missions were not yet coordinated with ground units. Later that day, Slovak headquarters gave orders for a complete aerial reconnaissance of all areas. Patrols spotted wide movement of Hungarians on Slovak territory. At 13:00, a flight of three Letov Š-328 reconnaissance aircraft was sent to attack the enemy in the area of Ulič, Ubľa and Veľký Bereznyj. The mission failed when pilots could not positively identify the enemy because of fog. It later turned out that they were Hungarians moving from Ubľa to Kolonica.

Two more fighter squadrons of three B-534s were then sent on missions. The first discovered Hungarian troops at the railway station in Ulič and destroyed some artillery pieces and other material in an attack. The second, also sent to Ulič, successfully destroyed a few Hungarian vehicles and damaged more equipment, but one plane was shot down and its pilot, Ján Svetlík, killed. Another Slovak squadron was sent to the area, this time to support Slovak ground units. It encountered Hungarian machine gun fire, and another B-534 was shot down. The pilot managed to land but died a few minutes later. The plane was then destroyed by Slovak soldiers. Two other B-534s attacked Hungarian troops and, heavily damaged and out of ammunition, returned to Spišská Nová Ves. The last Slovak mission of March 23 consisted of one Š-328, which destroyed an unknown number of Hungarian tanks and vehicles near Sobrance. Its pilot was injured and had to land near Sekčovice. Slovak pilots did not encounter the Hungarian Air Force that day.

In the first day, the Slovak Air Force suffered two B-534s destroyed, another four heavily damaged, and two pilots killed. But it had helped slow the Hungarian advance and inflicted significant damage. The next day, the situation rapidly changed.

On the morning of 24 March, one squadron of three B-534s took off to support Slovak units at Vyšné Remety. After reaching the area, they were surprised by three Hungarian Fiat CR.32s, and two of the Slovak planes were shot down, with one pilot killed.^[6] At 07:00, six B-534s from Piešťany landed in Spišská Nová Ves; three of them then took off to support infantry near Sobrance. Two were shot down, and one Slovak pilot was captured.

Near Michalovce, nine Hungarian fighters shot down three B-534s, which were covering three Letov Š-328s as they bombed Hungarian infantry. One Š-328 was also shot down and the pilot killed. Another had to land because of mechanical problems. From the six-plane formation, only one returned to Spišská Nová Ves.

On the same day, 24 March, the Royal Hungarian Air Force also bombed Spišská Nová Ves, which was the base of all Slovak air operations. The 36 bombers were supported by 27 fighters assigned to the mission, but poor organization, faulty navigation, mechanical problems and last-minute changes caused actually only about 10 bombers to take part in the attack.

Because Slovakia lacked an early-warning system, the Hungarians found the airfield's defences unprepared. Anti-aircraft guns were without crews and ammunition. Most of the Hungarian bombs missed the air operations base, but several hit the airfield, a storage facility, a hangar, a brickworks and a barracks yard.^[7] Many of the bombs landed in mud and failed to explode.

Although the bombers damaged six planes and several buildings, their mission was not fully successful, as the airfield continued to operate until the end of the conflict.

On 27 March, 13 victims of the bombing, some of them civilians, were buried, arousing intense anti-Hungarian sentiment.

The sole Hungarian Air Force loss of the entire conflict was a Fiat fighter, accidentally shot down by Hungarian artillery. After the bombing of Spišská Nová Ves, Major Ján Ambruš arrived there on 25 March to organize a revenge air strike on Budapest, but the war ended before that could be carried out.

• Sum total: 807 casualties on both sides, 81 killed (30 military & 51 civilians), 55+ wounded (unknown breakdown), 671 captured, (All Czech/Slovak, 46.3% Czech 53.7% Slovak).
• Hungarians: 23 killed (8 military, 15 civilians), 55 wounded, none captured
• Slovaks: 48 killed (22 military & 36 civilians), unknown wounded, 671 captured (360 Slovaks & 311 Czechs from Bohemia and Moravia).

Slovakia had signed a protection treaty with Germany, which violated the treaty by refusing to help the country. Germany did not support Slovakia during the Slovak-Hungarian negotiations in early April either. As a result, by a treaty signed on 4 April in Budapest, Slovakia was forced to cede to Hungary a strip of eastern Slovak territory (1,697 km², 69,930 inhabitants, 78 municipalities), corresponding today to the area around the towns of Stakčín and Sobrance. The war killed 36 Slovak citizens.

The two sides' claims were contradictory. At the time, Hungary announced the capture of four light tanks and an armoured car, but no Slovak light tanks ever entered action and a medal was awarded to the man who recovered the one knocked-out armoured car from no man's land in the night. On the other hand, the Hungarians certainly captured at least one LT vz.35 light tank and one OA vz.27 armoured car in March. The contradictions are attributable to a combination of the fog of war, propaganda and confusion between Hungarian captures in Carpatho-Ukraine and eastern Slovakia.

Slovak casualties are officially recorded as 22 dead, all named. On 25 March, Hungary announced its own losses as 8 dead and 30 wounded. Two days later it gave a figure of 23 dead and 55 wounded, a total that may include their earlier losses occupying Carpatho-Ukraine. It also reported that it was holding 360 Slovak and 311 Czech prisoners. Many of the Slovaks presumably belonged to the two companies that were reportedly surprised asleep in the barracks in the first minutes of the invasion. The Czechs were stragglers from the garrison of Carpatho-Ukraine.

• Croatian–Romanian–Slovak friendship proclamation, an alliance aimed at stopping further Hungarian expansion

• Axworthy, Mark WA (2002). Axis Slovakia – Hitler's Slavic Wedge, 1938–1945. Bayside: Axis Europa Books. ISBN 1-891227-41-6.
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• "The Slovak-Hungarian Frontier, 1918–1939". Archived from the original on 4 February 2011. – brief overview of the historical context
• Šipeky, Michal (11 February 2007). "Vojenský konflikt". "Malá vojna" a účasť slovenského letectva v nej (in Czech). Valka.