The siege of Plzeň lasted from 14 July 1433 to 9 May 1434 and was an important encounter of the Hussite Wars. Hussite troops led by Prokop the Great had unsuccessfully besieged the Catholic city of Plzeň for nine months and twenty three days. Failure to capture one of the last major Catholic cities in Bohemia along with the fall of New Town was a huge blow for the Hussite groups that foreshadowed their decisive defeat in the Battle of Lipany.