Ἔγεστα

A military device, erected out of stones and timbers and earth. "Those working on this make a screen of goat-hair cloths, which are called Cilician, having sufficient thickness and length, and they attached them to long pieces of wood [...]. For there neither burning arrows nor any other weapons could reach [the workmen], but they remained there in the screens."¹
But some say that this device is called agesta with an a.²