Just a nomenclature note:
However, the Dromon and 'Greek Fire' are total Fantasy, in that the maximum range of a Fire Projector was less than 100 meters, or less than that of even the lightest catapult or self-bow. What set Greek Fire apart was not the range, but the fact that if it hit any ship that ship was destroyed - the fire could not be extinguished with water, so unless the enemy ship happened to have a large supply of sand or wet blankets to smother the fire, and fearless men to brave the fire, it was going to go up like the proverbial Torch.
In addition, the projectors were absolutely worthless against any land unit. With the short range, unless the enemy was conveniently standing in the surf, they were out of range unless you beached your ship. The Greek Fire could be used to attack, say, a city harbor or light house or wharf or any other waterline construction, but enemy troops just had to amble back about half a Hippodrome's length from the waterline and they were pretty much safe.
Oh well, it does make the point, if with the wrong mechanic, that the Byzantines have both land and naval Offensive Units.
Still want to try the Gauls first, though . . .