Cacertian RN 38cm Mk III
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| Royal Navy 38cm Mark III | |
|---|---|
 A 38cm Mark III in a static mount during the Divide War. | |
| Type | Naval Gun Railroad Gun |
| Place of origin |  Cacerta |
| Service history | |
| In service | 1913 – 1951 |
| Used by |  Cacertian Royal Navy |
| Wars | Divide War Siduri War |
| Production history | |
| Designed | 1910 |
| Manufacturer | CNRC Ordnance Bureau |
| Produced | 1911 – 1928 |
| Specifications | |
| Weight | 268 tons |
| Length | 31.6 meters |
| Barrel length | 16.1 meters |
| Shell | Separate-loading, cased charge |
| Caliber | 380 mm |
| Elevation | 0° to 55° when statically emplaced |
| Traverse | Up to 360° when statically emplaced Up to 2° when on rails |
| Muzzle velocity | 1040 m/s |
| Effective firing range | 22,200 meters |
| Maximum firing range | 47,500 meters |
The Royal Navy 38cm Mark III was a Cacertian long-range, heavy siege gun first used during the Divide War and later deployed by Cacerta during the Siduri War. It was originally developed as a naval gun but was later adapted for land service when better naval guns were deployed on the ships the Mark III had originally been intended for. With an extremely long range and devastating firepower, the Mark III’s could annihilate Syaran fortifications; however their overall impact in the Divide War was hampered by their lack of relative accuracy and slow fire-rate.
During the Divide War, they were deployed in static positions after the battle-lines in the conflict had become well-defined. Four of them were deployed to Syara, manned by the Royal Navy, as part of the Cacertian Expeditionary Force and participated in almost all of the attempted pushes to Zovahr. Following the Cacertian Empire’s defeat, only two were salvaged and returned home while the remaining two were destroyed; the remnants of the emplacement can still be seen in Syara today.
When Common Axis forces began their counter-attack against the Inner Sphere during the Siduri War, the 38cm Mark III guns that survived the Divide War were deployed as part of Cacerta’s heavy artillery battalions. Unlike in the previous conflict, however, all of the Mark IIIs were mounted on railway carriages for the sake of transportation in light of the war’s more mobile warfare.