Sometime during 891, according to the "Annals of Fulda", Arnulf sent an embassy led by margrave Arbo to Moravia in order to renew the peace. A letter written by the margrave soon announced that the legates were returning from Svatopluk and the Moravians who had agreed "to give themselves in friendship". Svatopluk, however, broke his pledges, so Arnulf decided to invade Moravia in 891. First the king met with Braslav, the Slavic "dux" on the river Sava, then raised an army of Franconians, Bavarians and Alamanni, and also recruited Hungarians to join his campaign. In the late 10th century, Arnulf was accused by Ottonian authors of unleashing the Hungarians on Europe because of his desire to bring down Moravia.