Here is a possible civilopedia entry for the "Fire Catapult" if anyone wants it. The description is currently customised as though the unit is only available as a UU to the Greeks and Romans.
(Which is the way I have implemented it in my Modpack - as 0/0/1 5/1/1)
#PRTO_Fire_Catapult
^
^
^Primitive artillery, [catapults] are devastating siege weapons in Ancient Times. They are used to
$LINK<bombard=GCON_Combat> city defenses to soften the attack for accompanying soldiers.
Catapults have no attack or defense power, so they should be protected by an escort. Finally,
they are wheeled so they may not enter $LINK<mountains=TERR_Mountains> or $LINK<jungles=TERR_Jungle> unless following
a road. Combined with Greek Fire, Catapults are enhanced in terms of their destructive power.
#DESC_PRTO_Fire_Catapult
^
^
^The catapult was one of the earliest forms of artillery. It was a large mechanical arm that propelled heavy
stones and other missiles from a great distance, battering down walls and inflicting damage on buildings and
defenders. Though cumbersome and nearly useless on the battlefield, the catapult was an effective weapon for
siege operations.
^
^The Romans used the catapult extensively in conquering their empire, as did the Greeks. They created a new model, that involved a sling. Still, the sinews that held the arm of the catapult back were a problem in accuracy. In the humid air, the sinews would expand and weaken, making the catapult unable to shoot straight. The sinews would also grow weak with usage, and had to be replaced often, which was not practical during battles. The catapult became obsolete with the invention of the cannon, the rifle and explosives, although the basic principles of projectile motion are still found in missile launchings, among other things.
^
^Greek Fire was the secret weapon of the Eastern Roman Emperors. It is said to have been invented by a Syrian Engineer, one Callinicus, a refugee from Maalbek, in the seventh century (673 AD). The "liquid fire" was hurled on to the ships of their enemies from siphons and burst into flames on contact. As it was reputed to be inextinguishable and burned even on water, it caused panic and dread. Its introducation into warfare of its time was comparable in its demoralizing influence to the introducation of nuclear weapons in our time. Both Arab and Greek sources agree that it surpassed all incendiary weapons in destruction. The secret behind the Greek fire was handed down from one emperor to the next for centuries. Rumors about its composition include such chemicals as liquid petroleum, naphtha, burning pitch, sulphur, resin, quicklime and bitumen, along with some other "secret ingredient". The exact composition, however, remains unknown.