Shortly after the First Siege of Krujë , Murad II died Death in Edirne , only to be succeeded Change_of_leadership by his son Mehmed II .

In the three-day battle Hostile_encounter the Ottoman army under the command Control of Sultan Murad II defeated Conquering the Crusader army of regent John Hunyadi .

On 19 October Murad II used Using his `` sipahi '' cavalry from Thessaly to envelop Besieging the cavalry on the Crusader left flank , along with a general assault Attack all along the line to distract Preventing_or_letting Hunyadi from the primary effort .

On 20 October , with Murad II personally observing Perception_active the struggle , the Janissaries attacked Attack and killed Killing everyone left in the stockade .

With the end Process_end of the half-century-long Crusader threat Warning to their European frontier , Murad 's son Mehmed II was free Releasing to lay siege to Constantinople in 1453 .

The Battle Hostile_encounter of Kosovo took place Process_start on 15 June 1389 between an army led Causation by the Serbian Prince Lazar Hrebeljanović and an invading Attack army of the Ottoman Empire under the command of Sultan Murad Hüdavendigâr .

The bulk of both armies were wiped Removing out in the battle Hostile_encounter , and both Lazar and Murad were killed Killing .