The
Battle of Mohi (today
Muhi), also known as
Battle of the Sajó River or
Battle of the Tisza River (11 April 1241), was the main
battle between the
Mongol Empire and the
Kingdom of Hungary during the
Mongol invasion of Europe. It took place at
Muhi, southwest of the
Sajó River. After the invasion, Hungary lay in ruins. Nearly half of the inhabited places had been destroyed by the invading armies. Around 15–25 percent of the population was lost, mostly in lowland areas, especially in the
Great Hungarian Plain, the southern reaches of the Hungarian plain in the area now called the
Banat and in southern
Transylvania.