 Complete the following phrase:  Diakos and his band, reinforced by the fighters of Dimitrios Panourgias and Yiannis Dyovouniotis, decided to halt the Ottoman advance into Roumeli by taking defensive positions near Thermopylae. The Greek force of 1,500 men was split into three sections. Dyovouniotis was to defend the bridge at Gorgopotamos, Panourgias the heights of Halkomata, and Diakos the bridge at 