Battle of Leitzersdorf The Battle of Leitzersdorf was a battle between the Holy Roman Empire and the Kingdom of Hungary in 1484 . Fuelled by the earlier conflicts of Matthias Corvinus and Frederick III , Holy Roman Emperor it marked the end of anti - Ottoman preparations and initiations of a holy war . It was the only open field battle of the Austro - Hungarian War , and the defeat meant – in long terms – the loss of the Archduchy of Austria for the Holy Roman Empire . Background . Since the successful siege of Hainburg in October 1482 Queen Beatrice of Naples worked on the restoration of peace . In 1482 she envoyed the Provost of Bratislava , Georg Schönberg , Johann Hessler , Dean of Friesach and Gerhard Peuscheren , locum tenens of Fresach , repeatedly to start mediation with Johann Beckensloer Archbishop of Vienna and counselor of the Emperor . The Queen ' s intention with this was that Beckensloer could pose as a peace broker rather than a pro - imperial official . She offered the chance the earn himself fame by trading back the lost Salzburg area via this supposed treaty . Even though the return of these forts were demanded previously by the Emperor himself it was never realized and Matthias held them to his death . The following year , the war resumed because despite the negotiations , the parties never came to an agreement . In January 1483 the Kőszeg was captured and in April Klosterneuburg fell as well and by constant plundering the Hungarians tried to weaken the enemy ' s strength . Matthias in order to concentrate the full force against the Emperor so in January 1483 he has sent agents even to the Porte to begin negotiations on a ceasefire , which had a positive outcome . He immediately reported it to the Holy Roman electoral principalities . Matthias declared he was not willing to defend the Christianity anymore unless other countries joined him . Premise . The Hungarians attacked Lower Austria from three directions . István Dávidházy marched to Bruck an der Leitha and besieged it . On 24 February the city surrendered and on 12 March the castle was captured as well . The second wave with captain Tobias von Boskowitz and Černahora reached Krems and Stein and waited in a nearby river island . The third army led by Péter Geréb invaded the Duchy of Styria and the Duchy of Carinthia to block the Holy Roman forces from uniting . Meanwhile Matthias occupied Kahlenberg in April and Dávidházy went on to encircle Korneuburg . The Emperor decided to relieve the city and managed to smuggle a fleet of 12 ships of supplies into the city and also sent a relief army to the scene . Fort captain Burghard Kienberger decided to resist until the arrival of the reinforcement army . Being informed of the advancing Austrians , Dávidházi opted for a pre - emptive strike in the vicinity of Stockerau . The battle . In the early course of the battle , the Imperial cavalry gained advantage and made the Black Army retreat . The Holy Roman troops occupied the abandoned Hungarian camp , which they sacked immediately . Seeing a chance in it to regroup , Dávidházy planned a counter - attack on the looting scattered Imperials . The Hungarian heavy cavalry flank attacked the Holy Roman wing that withstood for about an hour , but collapsed and fled from the battleground . After Dávidházi returned to the siege at Korneuburg he was hit by a bullet and died shortly after . Matthias took charge of the troops and implemented the takeover . Aftermath . The city of Korneuburg surrendered on 1 December after Matthias was joined by 12 , 000 men of the Silesian corps . The withdrawing Holy Roman Army had no other choice than to immobilize itself and split to strengthen the remaining fortresses to slow down the advance of Matthias . They were no longer in the position to take the initiative . The rest of Lower Austria was annexed the following year and Frederick had to make peace with Matthias allowing him to keep his conquests . However the conflict aggravated their relationship for the time being . While most of his armies were stationed in the North - West region of Hungary Matthias was unable to prevent the Ottomans from breaking into Bessarabia and even Hungary the same year .