The relationship between Andrew and Leszek the White had meanwhile become tense. Leszek granted Vladimir-in-Vohynia, which was the most prestigious princely seat in Volhynia, to Daniel and Vasilko Romanovich. He also failed to support Coloman during the siege of Halych. The Hungarian army invaded western Galicia and captured Przemyśl and Lubaczów in late 1215 or early 1216. Leszek approached Mstislav Mstislavich, Prince of Novgorod, seeking his assistance against the Hungarians. The reconstruction of the ensuing events is difficult, because their dating is uncertain. Mstislav invaded Halych between 1215 and 1219most probably in early 1219, according to Font and Barabásand forced Coloman, Benedict the Bald and Sudislav to flee to Hungary.