One of the most annoying defensive/offensive structure is the Aramonian Trebuchet and, oddly enough, the other four kingdoms (Taros, Veruna, Zhon, Creon) are not the only ones who have a problem dealing with them. Even Aramon has a problem with them when facing another Aramon! Here are some tips which I hope will help to deal with them.
1] When you see your ground units or structures to be hitted by something that looks like an extremely-fast moving cannonbal it is by 95% a Trebuchet. The first thing you should do is to detect the way from where that "cannonball" came. It is not an easy thing to detect its coming direction, you actually can only notice the moving Trebuchet's projective just before it hits you, but you must!
2] After detecting its direction, quickly create an aerial scout (Spyhawk in Aramon) and send it flying towards the Trebuchet's direction. Sooner or later, you will notice a big wooden structure with a round stone base. This is the Trebuchet. If your Spyhawk is killed by Archers or something else before you locate the structure, make a few more Spyhawks and send them all together. Luckily, someone will survive to see the Treb's location.
3] Deal with the problem! Destroy the Trebuchet!! This may be an easy or an extremely difficult task, depends on how well the Aramonian player guards this engine of destruction. The most common way is to create a dozen of very fast ground units (Horsemen or Knights) and send them alltogether against the Treb. Another way is by using your siege units (Catapults, Cannons, even Rolling Towers) and destroy it from distance.
4] In case the upper strategy doesn't work because the Aramonian ground defenses are too strong (many Strongholds or a lot of infantry for example) or because the terrain makes it impossible (aquatic maps for example) you should stop being polite with your foe! Build a Trebuchet (you are an Aramon player too, after all)! Just build it as fast as possible (the use of multiple Mage Builders or Flying Builders is highly effective, if you have the mana of course) and make sure your opponent cannot scout the area where you are building your machine of destruction. Aramon players who already have a ready Treb love to blow up non-prepared hostile ones, so be careful! Guard Towers, Archers, Strongholds, Mage Archers, Rolling Towers, even Acolytes are good at butchering hostile Spyhawks, and Barbarians, Titans, even Swordsmen are good ground defenders. Keep your Trebuchet into the darkness of the fog of war, while bringing your enemy's Treb into your unit's eyesight!
5] If you play on an aquatic map and the enemy has built an Aramonian Trebuchet near the coast, you can perform a surprise naval attack. War Galleys will easily blow the structure up, if it is on range, and they can also carry a few troops. So bombard the place with you War Galleys and upload your troops at the same time. If you wish to turn this into a full base assault, you should also bring an Ark full of troopers, upload them on the shore, and the party begins!
6] Here is some extra info about the trebuchet:
* Trebuchets cost more than 10000 mana and are slow in production, so if you destroy it before it act your opponent will lose a lot of time and a lot of mana for nothing!
* Trebuchets have tremendous range! In small maps, they can easily hit any ground/naval unit or building. However, they cannot hit aerial units and in big maps you can keep your ground/naval units safe by leading them out of the Treb's range.
* Trebs are rediculously fragile. It is by far the Aramonian building with the less hit points (if you exclude Lodestones), so they can be destroyed really fast.
* You are Aramon, so think twice about this machine of destruction. Consider both its advantages and disadvantages, its strengths and its weaknesses. You can build one of those, or face it against a match. Always think twice; how to build it, and how to destroy it...