I think the common conception of a Trojan Horse stems from a misunderstanding by Homer. In Caesar's history of the conquest of Gaul, which was written about a thousand years later but technology did not change quickly back then, he describes a siege tower, which was made of wood framing covered with horse-hides. It was built at a safe distance from the besieged city (Alesia = Arles), then carried to the wall by a large number of soldiers inside. They then swarmed up ladders inside and onto the wall. One can well suppose that the soldiers called it a wooden horse, and subsequently spoke of entering the city after being in it. Caesar does not describe its shape, but it probably even resembled a horse's head and neck, because it probably had a forward projection at the top, a vertical front wall, and a wide base for stability and to provide room for the carrying.