← 3135
Derf nearby systems
Derf nearby systems
(Map Legend)
System Information
X:Y Coordinates -130.839 : 394.669[e]

The Derf system is the location of at least one habitable world, and as of 3145 was located in the Clan Hell's Horses Occupation Zone.[1][2]

System Description[edit]

The Derf system is located near the Trell and Wotan systems.[1][2]

System History[edit]

The Derf system was colonized at some point between 2334 and 2338 during early colonization efforts by the Rim Worlds Republic.[3]

Political Affiliation[edit]



Planetary History[edit]

Early History[edit]

Derf was one of seven worlds settled by colonists from the Rim Worlds Republic between 2334 and 2338 as an attempt by Maxwell Rowe to create a buffer zone between the Republic, the Draconis Combine and the Tamar Pact.[3]

Reunification War[edit]

By the end of the Age of War, Derf was a part of the Apollo Province of the Rim Worlds Republic.[4]

Civil war erupted in the Rim Worlds Republic in 2575, with the factions polarized around those loyal to First Consul Gregory Amaris and those loyal to the Rift Republican Army and the Rim Provisional Government.[42] The Star League eventually decided to intervene in the civil war in support of Gregory Amaris, and in 2579 assembled Task Force MAILED FIST to help secure Amaris' control over the Rim Worlds Republic. A multinational force headed by the Star League Defense Force, Task Force MAILED FIST was responsible for executing Operation MAILED FIST, the name given to the military intervention. the first wave of attacks focused on securing significant worlds near Apollo,[43] until a destructive raid on Alarion by the Fourth Amaris Fusiliers in retaliation prompted the SLDF to alter its initial strategy for the campaign, the focus shifted to reducing Rim Worlds Army concentrations throughout the Republic and the capture of key worlds.[44]

In late 2584 the SLDF changed tactics again; a number of major RWA units had been destroyed or captured, and the focus for the campaign shifted to capturing worlds of strategic importance, but the campaign was slowed by the greatly increased resistance offered by the RWA and local civilian populations, prompted by atrocities performed by the Draconis Auxiliary Corps when they captured Nightwish in mid-2584. The conquest of Derf was one such example of a campaign that took longer than originally planned due to the level of resistance offered by the civilian population; General Nathan Isaacson of Battle Group Apollo assigned the Seventeenth Royal Division - one of three divisions that comprised VI Corps - to conquering Derf in 2586, but even a year after the planetary capital had been occupied instances of civil unrest were still occurring.[45][46]

Star League Era[edit]

Derf was conquered by the Lyran Commonwealth during the 2773-2775 Republic-Commonwealth War.[14]

Clan Invasion[edit]

Derf was conquered by Clan Jade Falcon during the Second Wave of Operation Revival in May 3050. The Third Falcon Talon made their landing on the planet, intending to finish off the survivors from the Twelfth Donegal Guards who had escaped from Trell I. However, so disheartened were the Donegal Guards at their earlier defeat that many simply gave up without a fight. Those few who continued to resist were easily crushed and by the end of the day the planet belonged to the Jade Falcons.[47]


The planet was invaded again during the Jihad, when Clan Ice Hellion launched an invasion of Clan Jade Falcon holdings in the Inner Sphere in early 3071. Derf was invaded by the Ice Hellions between the 7th and 28th of June 3071, but the Ice Hellion invasion stalled as heavy fighting continued on Wotan and other worlds throughout July 3071.[32][33] The Ice Hellions finally captured Derf in late 3071, when Star Captain Vandal Hildenrath led the 401st Striker Trinary to the system. In late December, forces from Clan Jade Falcon's Alpha Galaxy arrived to recapture the world, and a Star Commander named Elric led a batchall for a Trial of Possession for the planet. Hildenrath defeated Elric's forces in battle in Reichman's Valley, killing two of his MechWarriors, but subsequently allowed him to challenge her to a Trial of Grievance for the planet. The Trial was fought via a game of chess, which Hildenrath lost intentionally; the loss allowed her to withdraw with her forces and follow saKhan Connor Rood's general call to withdraw, joining her forces with his in the Somerset system in late January 3072.[34]

Planetary Rulers[edit]

Military Deployment[edit]







Planetary Locations[edit]

  • Hollers

Industrial Centers[edit]

Map Gallery[edit]

Nearby Systems[edit]

Closest 36 systems (33 within 60 light-years)
Distance in light years, closest systems first:
Wotan 17.8 Trell 18.5 Butler 19.9 Treeline 21.9
Malibu 22.2 Beta 26.1 Persistence 27.2 Golandrinas 29.2
Maxie's Planet 34.8 Waldorff 35.9 Twycross 37.0 Steelton 37.3
Apollo 37.8 Toland 39.7 Blackjack 39.9 Somerset 42.2
Romulus 43.9 Goat Path 47.3 Hot Springs 48.0 Renren 48.2
Black Earth 49.6 Bensinger 49.9 Denizli 50.5 Icar 51.1
Evciler 52.1 Here 53.7 Alyina 53.9 Anywhere 55.1
Chateau 55.1 New Ålborg 56.0 Apolakkia 56.2 Seiduts 59.0
Kookens Pleasure Pit 59.7 Roadside 60.1 Biegga 60.2 Star's End 60.6


  1. 1.0 1.1 1.2 Era Report: 3145, p. 39: "Inner Sphere - [3145] Map"
  2. 2.0 2.1 2.2 Field Manual: 3145, p. VI: "Inner Sphere - [3145] Map"
  3. 3.0 3.1 3.2 The Periphery, 1st Edition, p. 18: "From Rim to Tamar"
  4. 4.0 4.1 Handbook: Major Periphery States, p. 18: "Rim Worlds Republic after Age of War - [2571] Map"
  5. Handbook: House Steiner, p. 25: "Lyran Commonwealth after Age of War - [2571] Map"
  6. Historical: Reunification War, p. 158: "Inner Sphere - [2596] Map"
  7. Handbook: Major Periphery States, p. 25: "Rim Worlds Republic At the Fall of the Star League - [2750] Map"
  8. Era Report: 2750, p. 36: "Inner Sphere - [2750] Map"
  9. Field Manual: SLDF, p. vii: "Inner Sphere - [2764] Map"
  10. Historical: Liberation of Terra Volume 1, p. 10: "Inner Sphere - [2765] Map"
  11. Field Report 2765: Periphery, p. 38: "Rim Worlds Army Deployment Map - [2765]"
  12. Field Report 2765: LCAF, p. 25: "Lyran Commonwealth Armed Forces Deployment Map - [2765]"
  13. Historical: Liberation of Terra Volume 1, p. 104: "Rim Worlds Republic - [2767] Map"
  14. 14.0 14.1 Handbook: Major Periphery States, p. 37: "The Republic-Commonwealth War"
  15. Handbook: House Steiner, p. 36: "Lyran Commonwealth after First Succession War - [2822] Map"
  16. Historical: Liberation of Terra Volume 2, pp. 122–123: "Inner Sphere - [2822] Map"
  17. Handbook: House Steiner, p. 40: "Lyran Commonwealth after Second Succession War - [2864]"
  18. House Steiner (The Lyran Commonwealth), p. vii: "Lyran Commonwealth Map - [3025]"
  19. Handbook: House Steiner, p. 47: "Lyran Commonwealth after Third Succession War - [3025] Map"
  20. Handbook: House Steiner, p. 56: "Lyran Commonwealth after Fourth Succession War - [3030] Map"
  21. Handbook: House Steiner, p. 59: "Lyran Commonwealth after War of 3039 - [3040] Map"
  22. Historical: War of 3039, p. 132: "Inner Sphere - [3040] Map"
  23. Era Report: 3052, p. 10: "Inner Sphere - [3050] Map"
  24. Handbook: House Steiner, p. 61: "Lyran Commonwealth after Clan Invasion - [3052] Map"
  25. Era Report: 3052, p. 22: "Inner Sphere - [3052] Map"
  26. Objective Raids, p. 31: "Map of the Jade Falcon Territory"
  27. Era Report: 3062, p. 10: "Inner Sphere - [3057] Map"
  28. Era Report: 3062, p. 28: "Inner Sphere - [3063] Map"
  29. Inner Sphere, p. 75: "Lyran Alliance Map"
  30. Handbook: House Steiner, p. 70: "Lyran Commonwealth after FedCom Civil War - [3067] Map"
  31. Jihad: Final Reckoning, p. 42: "Inner Sphere - [3067] Map"
  32. 32.0 32.1 Jihad Hot Spots: 3076, p. 16: "Timeline of the Jihad"
  33. 33.0 33.1 Jihad: Final Reckoning, p. 49: "The Jihad In Review"
  34. 34.0 34.1 34.2 Operation ICE STORM Part Two: Winds of Spring, pp. 47–55
  35. Jihad Secrets: The Blake Documents, p. 63: "Inner Sphere - [3075] Map"
  36. Field Report: Clans, p. 26: "Clan Jade Falcon/Clan Wolf in Exile Deployment Map - [August 3079]"
  37. Jihad: Final Reckoning, p. 62: "Inner Sphere - [3081] Map"
  38. Field Manual: 3085, p. vii: "Inner Sphere - [3085] Map"
  39. Era Report: 3145, p. 11: "Inner Sphere - [3135] Map"
  40. Shattered Fortress, p. 102-103: "Inner Sphere - [3151] Map"
  41. Tamar Rising, poster map
  42. Historical: Reunification War, p. 130: "The Spark"
  43. Historical: Reunification War, p. 132: "Case Apollo"
  44. Historical: Reunification War, p. 133: "Island Hopping (2582 - November 2590)"
  45. Historical: Reunification War, p. 134: "Arlina to viborg (December 2584 - September 2588)"
  46. 46.0 46.1 Historical: Reunification War, p. 152: "Rim Worlds Republic Front (Jump-off - 2587)"
  47. Jade Falcon Sourcebook, p. 39
  48. Field Report 2765: Periphery, p. 19: "Republican Guards - Divisional Status"
  49. Field Report: Clans, p. 15: "Clan Jade Falcon Deployment Status"
  50. Field Manual: 3145, p. 167: "Clan Force Deployments - Clan Hell's Horses"
  51. House Steiner (The Lyran Commonwealth), p. 142: "Other Major Commonwealth Industries"