Panourgias and Yiannis Dyovouniotis with their bands of armatoloi (a total of perhaps 1,500 men) took up defensive positions at the river Alamana (Spercheios), near Thermopylae . Vryonis' attack forced Panourgias and Dyovouniotis to retreat, leaving Diakos alone. Diakos's men fought for several hours before they were overwhelmed. Battle of Thermopylae