Maybe they will just use terms like onager or mangonel, without much worry about historical definitions.
In fact, 'Mangonel' was a semi-generic European medieval term for any one-armed catapult-like weapon, including early Trebuchets.
Could you (or someone else) please elaborate on siege weapon dating for historical barbarians like me?
As early as 2400 BCE siege towers and battering rams or picks (against mud-brick walls) are shown being used by Egyptians (and in response, towers are being embedded in walls to provide flanking fire against towers and battering rams!)
The earliest 'artillery' seems to have been the oversized bow catapult invented in Syracuse, Sicily around 400 BCE and the traction trebuchet invented in China at very roughly the same period.
The Greeks within a century had expanded catapult development from bolt-throwing to stone-throwing and torsion propulsion using wound ropes for power. Consequently, by the Imperial Roman period catapults were available in all sizes from 2-man semi-mobile Carroballistae to larger crew-served stone-throwing Onagers.
The Chinese traction trebuchet was introduced to Europe by the Avars in the second half of the 6th century CE, and was adopted by the Byzantines by 587 CE. Traction trebuchets were called Mangonels or Petraries and ranged from one-man machines with a single rope to throw a single projectile long ranges, up to massive engines with mutliple ropes and 20 - 100 people pulling on them to launch projectiles up to 60 kg.
Another 'engine' used in Europe was the Great Crossbow, first recorded in the Siege of Paris in 845 CE. These bows, either stave or composite, could fire large bolts weighing over 2.5 kg that in one instance "skewered several Vikings like meat on a spit". They required some kind of winch mechanism to draw the bows and so were crew-served weapons, but could be transported intact, unlike trebuchets of any kind, and so were used until at least the 13th century in France and England and even mounted on ships by Venice in the 13th century.
The earliest mention of a Counterpoise or Counterweight Trebuchet may be in 1097 CE by Alexis Kommenos of Byzantium, but the record is obscure: he only speaks of a 'new engine' with no details. By the following century the Counterpoise Trebuchet is in general use by both Christian and Caliphates in the Middle East - they appear specifically in the Crusader States by 1124 CE.
By 1129 CE the Song Dynasty decrees that all Chinese warships have trebuchets firing gunpowder incendiary bombs, the first certain record of gunpowder naval weapons. These were traction trebuchets, though - the first certain record of a Counterpoise Trebuchet in China is in 1268 CE, used by the Mongols against a Southern Song city, manned by Persian crews imported along with the technology from the west. These machines could throw 100 kg rocks that penetrated up to 2.5 meters into the rammed earth city walls.
In 1304 CE Edward I of England's largest counterweight Trebuchet took 4 master carpenters and 49 workers 3 months to build on site for the siege of Stirling. These were NOT mobile machines!
The last known use of any trebuchet in Europe was at the Siege of Burgos in Spain in 1475 CE.
The replacement for all the earlier 'artillery' was the explosive-gunpowder-powered Bombard, developed in Europe as a wall smashing weapon. They first appear in the record between 1362 and 1372 CE: on the latter date they were used in France at the Siege of Bourges where a 1-ton Bombard firing 45 kg stone shot demolished walls and towers both.
In 1377 CE Burgundy used massed Bombards firing shot up to 90 kg in weight against the fortified city of Odruik which so damaged the city walls that the city surrendered immediately. That was, effectively, the end of the traditional stone curtain wall and stone tower as a defense for a city in Europe.