Ladislaus joined forces with Rudolf I of Germany to launch a campaign against Ottokar II. Ladislaus's troops played a decisive role in Rudolf's victory in the Battle on the Marchfeld on 26 August. Ottokar was killed in the battlefield. After the battle, King Rudolf I gave Ladislaus "his thanks, declaring that through his help all Austria and Styria had been restored to him",Simon of Kéza: The Deeds of the Hungarians (ch. 2.74), p. 155. according to Ladislaus's chronicler, Simon of Kéza.
Ladislaus joined forces with Rudolf I of Germany to launch a campaign against Ottokar II. Ladislaus's troops played a decisive role in Rudolf's victory in the Battle on the Marchfeld on 26 August. Ottokar was killed in the battlefield. After the battle, King Rudolf I gave Ladislaus "his thanks, declaring that through his help all Austria and Styria had been restored to him",Simon of Kéza: The Deeds of the Hungarians (ch. 274), p. 155. according to Ladislaus's chronicle.r, Simon of Kéza.