In 1241, after raiding Lesser Poland, the Mongols invaded Silesia and caused widespread panic and mass flight. They looted much of the region, but abandoned their siege of the castle of Wrocław, supposedly after being fended off by Blessed Czeslaw's "miraculous fireball." They then defeated the combined Polish and German forces under Henry II at the Battle of Legnica, which took place at Legnickie Pole near Legnica. Upon the death of Ögedei Khan, the Mongols chose not to press forward further into Europe, but returned east to participate in the election of a new Grand Khan.