(δεκάς; dekás). From Homeric into Hellenistic times, the basic unit in Greek and Macedonian infantry and cavalry armies (Hom. Il. 2,126; Hdt. 3,25,6; Xen. Hell. 7,2,6; Hipp. 4,9; Arr. Anab. 7,23,3; Anaximenes FGrH 72 F4; P. Cairo Zen. 1,7-11; 2,22-24; Frontin. Str. 4,1,6), which was commanded by a decadarch (Xen. Hipp. 2,2-6). Normally, the unit comprised ten men with a possible further division into groups of five; deviations from this practice occurred.
1 Kromayer/Veith 90f.
2 M. Launey, Recherches sur les armées …