The most advanced and deadliest siege unit available, the Rocket Artillery shoots long-range, high-explosive rockets at its targets that are devastating against cities. What's more, its additional propelling power allows these missiles to travel farther than old artillery shells, even without the help of spotting equipment such as the Observation Balloon! Chances are your siege units will have collected enough XP to earn the Expert Crew promotion by the time you're ready to upgrade them to Rocket Artillery, but if they've earned the Forward Observers promotion as well, they won't be able to take full advantage of their Range unless you have other units to spot for them.
Be very careful when going up against a Rocket Artillery. Due to its long range, it can easily pick off most land units like Machine Guns despite a -17 Bombard Strength penalty against units. Thus, air units will be your best bet for destroying them. If they are supported by a Mobile SAM and other units, however, be ready for a scuffle.
For more details on how the move-and-shoot rule works, head here.
The Chinese Wu forces were firing off gunpowder-fueled rocket artillery as early as the siege of Yuzhang in 904 AD, although these were more colorful than deadly (save, perhaps, to their crews). The metal-cylinder ones used by the Tipu Sultan of Mysore in the 1780s and the British Congreve rockets in the 1790s weren’t much better. So it wasn’t until the German Nebelwerfer and Soviet Katyusha models of the Second World War that rocket artillery was anything but a curiosity on the battlefield. It was only after the war that designs in rocket artillery made them a mainstay for NATO and Warsaw Pact armies, poised to devastate Europe when the much-anticipated World War III broke out. The minimum recoil of rockets means that lighter carriages are needed, hence these can be more mobile (in fact, some can fire on the move); and advanced ones employ guidance systems, allowing for better accuracy against moving targets.
- The Rocket Artillery's model is based on the M270 Multiple Launch Rocket System.