Battle of W.l.n.d.r

The Battle of Wlndr was fought in 934 between the allied Hungarian-Pecheneg army and an army composing of the forces of the Byzantine Empire and First Bulgarian Empire, somewhere in the territory which belonged to the Bulgarian empire, near a big city called W.l.n.d.r (maybe Belgrade), by the Arab historian and geographer Al-Masudi, and resulted in a great victory of the firsts, followed by a devastating raid of the victors until the walls of Constantinople, forcing the Byzantine empire to pay them tribute for a long time (until 957). Al-Masudi's account of the battle is "one of the greatest descriptions of the nomadic war tactics."