- This article is about the planet. For the scenario pack, see The Battle For Twycross.
Note: X and Y are coordinates (light years on XY plane) relative to Terra at (0, 0)
Twycross nearby systems (3151)
|X:Y Coordinates||-108.349 : 365.246[e]|
|Recharge time||171 hours|
|Recharge station(s)||Zenith, Nadir|
| Jump point
|Moons||1 (Twycross III)|
|Atmospheric pressure||Standard (Breathable)|
|Equatorial temperature||65°C (Desert)|
|Highest native life||Mammal|
|Reference Year||3025 - 3079|
|Ruler||Yvonne Killa, Duchess of Trell (3025)|
|HPG (Representative)|| B (Precentor Briaz Culvertino) (3025)|
- 2341 - No record 
- 2571 - No record 
- 2596 - No record 
- 2750 - Lyran Commonwealth 
- 2764 - Lyran Commonwealth 
- 2765 - Lyran Commonwealth 
- 2786 - Lyran Commonwealth 
- 2822 - Lyran Commonwealth 
- 2864 - Lyran Commonwealth 
- 3025 - Lyran Commonwealth 
- 3030 - Lyran Commonwealth 
- 3040 - Federated Commonwealth 
- 3050 - Federated Commonwealth 
- 3052 - Clan Steel Viper 
- 3057 - Clan Steel Viper 
- 3063 - Clan Jade Falcon 
- 3065 - Clan Diamond Shark
- 3067 - Clan Jade Falcon 
- 3079 - Clan Jade Falcon 
- 3081 - Clan Jade Falcon 
- 3085 - Clan Jade Falcon 
- 3130 - Clan Sea Fox 
- 3135 - Clan Jade Falcon 
- 3145 - Clan Jade Falcon
Twycross is a weather-wild desert planet that orbits a large and hot sun, where cataclysmic events and powerful wind storms are common, and its people are used to this. Due to these storms and events the population placed their cities and towns underground or made surface structures squat and flat. Twycross has a massive and continuous storm known as the Diabolis, which spawns never ending destructive weather.
In the outer reaches of the Twycross system lies the world known as Jonah’s Reach. This uninhabitable planet became the Inner Sphere's major source of HarJel when Clan Diamond Shark acquired the system.
Late Succession WarsEdit
By 3025, Twycross had become part of the Lyran Commonwealth's Tamar Pact, but it had a low population and was the most undeveloped world within the province. Due to the nature of the planet, its government had become politically sly and subtle in how it conducted business. The justice inflicted on its people was rough even for a world living on the edge of civilization.
Twycross Invasion of Clan Jade FalconEdit
In June of 3050, Clan Jade Falcon invaded Twycross as a part of the Clan Invasion's Second Wave of attacks. The planet's defenders, the Twycross TMM, faced off against the Jade Falcon Guards. The militia unit put up a fanatical struggle against the Clan invaders but after three weeks of fighting, the survivors of the Twycross TMM withdrew from the planet. However, though losing the planet, they brought intelligence that aided the FedCom High Command in developing a strategy to overcome the Clans. It was here the 1st Somerset Strikers stole equipment from Jade Falcon to help close the Inner Sphere's technological disadvantage from the Clans.
Second Battle of TwycrossEdit
In September 3050, during the Fourth Wave of the invasion, a FedCom Task Force of several frontline combat units was deployed to Twycross. The task force consisted of 10th Lyran Guards, 9th FedCom RCT, and first two battalions of the Kell Hounds. The Jade Falcon defenders only consisted of the Jade Falcon Guards and elements of the Jade Falcon Eyrie, which engaged the FedCom forces on the Plain of Curtains and in the Great Gash canyon region. The battle turned in favor of the FedCom forces when Clan forces were lured into the Gash where Kai Allard-Liao detonated pre-planted powerful explosives in the walls of the Gash, resulting in the Jade Falcon Guards' destruction through being buried under tons of rock and rubble. The destruction and defeat of the Guards triggered the resignation of the Falcon's Khan, Timur Malthus.
Control of the planet was short-lived, as in November 3051, Gamma Galaxy of the Steel Vipers used the Diabolis Sandstorms against the defending Tenth Lyran and Ninth Federated Commonwealth RCTs. The 423rd and 428th Assault Clusters met the Tenth Lyran on the Plain of Curtains while the 94th Battle Cluster drove the Ninth FC from their defensive positions in Schreuder Heights back to the spaceport at Camora. A few hours later, the FedCom forces lifted off planet.
In November 3057 Clan Wolf's Khan Natasha Kerensky led Clan Wolf forces to Twycross where they battled with the Falcon Guard as part of a massive Trial of Refusal. In the the ensuing Combat Trial, Khan Kerensky initiated personal zellbrigen with Falcon Guard MechWarrior Joanna; the two battled in the Great Gash canyon, where the battle for Twycross was won for the Falcons when Joanna felled Kerensky in a last-ditch act of defiance.
Falcon Incursion and Diamond Shark ConquestEdit
In 3064, the Jade Falcon Occupation Zone became the target of Operation AUDACITY, the Lyran Alliance counter-offensive against the Jade Falcon Incursion. In Late October to early November, a Lyran Alliance task force led by General Archer Christifori challenged the garrison commander, Star Colonel Ravill Pryde, to a Trial of Possession for control of Twycross. On the 24th of November Archer's Avengers were in the process of landing when Ravill Pryde's Timber Wolf fired on the incoming DropShips. Seen as a breach of zellbrigen, the Avengers attacked the Jade Falcon Guards with full force, winning the ensuing battle. Captured and briefly made into a Bondsman, Diana Pryde was used to relay a message to Khan Marthe Pryde to end her conflict in Lyran space.
The Avengers detached their armor assets and other miscellaneous forces to garrison Twycross, while the Falcons resolved to never return to Twycross. However, in April 3065, Clan Diamond Shark issued a batchall for control of the planet. After five days of fighting the garrison force was dispatched and Twycross became a possession of Clan Diamond Shark. The Sharks had originally wanted the planet for its disabled BattleMech factory, but later scouts from the Clan discovered that a nearby orbiting planetoid in the system - Jonah's Reach - possessed a large deposit of HarJel.
By 3077, Twycross's old Trellshire Heavy Industries facility had been restored and re-configured to produce Diamond Shark designs for sale and Twycross had become the most prized Diamond Shark possession in the Inner Sphere. The Clan's flagship, the Nightlord-class battleship DCS Terror of the Deep, and a Galaxy of troops had been assigned permanently to defend Twycross and the HarJel mining complex on Jonah's Reach.
During the Bloody Tricentennial attacks the Trellshire Heavy Industries plant was destroyed in a nuclear explosion intended to both destroy the factory and the garrisoning Diamond Shark forces from Gamma Galaxy, who had been lured to the plant by a series of earlier explosions. The plant was initially described as having been heavily damaged.
3054 to 3061Edit
- 423rd Assault
- Fifty-seventh Striker|
- 94th Battle Cluster 
- 57th Striker Cluster 
- Eighth Assault Cluster
- Twenty-first Strike Cluster
- Twenty-eighth Cuiser Cluster
| Closest 36 systems (34 within 60 light-years)|
Distance in light years, closest systems first:
|Steelton||57.1||Dell||58.3||Kookens Pleasure Pit||60.1||Vulcan||61.1|
- House Steiner (The Lyran Commonwealth), p. 170, "Twycross Planet Guide"
- Masters and Minions: The StarCorps Dossiers, p. 153, "Clan Diamond Shark Key Worlds - Twycross"
- Objectives: The Clans, p. 5, "Twycross"
- Handbook: House Steiner, p. 13, "Lyran Commonwealth Founding -  Map"
- Handbook: House Steiner, p. 25, "Lyran Commonwealth after Age of War -  Map"
- Historical: Reunification War, p. 159, "Inner Sphere -  Map"
- Handbook: Major Periphery States, p. 25, "Rim Worlds Republic At the Fall of the Star League "
- Era Report: 2750, p. 37, "Inner Sphere -  Map"
- Field Manual: SLDF, p. vii, "Inner Sphere -  Map"
- Historical: Liberation of Terra Volume 1, p. 10, "Inner Sphere -  Map"
- First Succession War (Source Book), pp. 24-25, "Inner Sphere -  Map"
- Handbook: House Steiner, p. 36, "Lyran Commonwealth after First Succession War -  Map"
- Historical: Liberation of Terra Volume 2, pp. 122-123, "Inner Sphere -  Map"
- First Succession War (Source Book), pp. 112-113, "Inner Sphere -  Map"
- Handbook: House Steiner, p. 40, "Lyran Commonwealth after Second Succession War -  Map"
- House Steiner (The Lyran Commonwealth), p. vii, "Lyran Commonwealth Map - "
- Handbook: House Steiner, p. 47, "Lyran Commonwealth after Third Succession War -  Map"
- Handbook: House Steiner, p. 56, "Lyran Commonwealth after Fourth Succession War -  Map"
- Handbook: House Steiner, p. 59, "Lyran Commonwealth after War of 3039 -  Map"
- Historical: War of 3039, p. 132, "Inner Sphere -  Map"
- Era Report: 3052, p. 11, "Inner Sphere -  Map"
- Era Report: 3052, p. 23, "Inner Sphere -  Map"
- Era Report: 3062, p. 10, Inner Sphere -  Map
- Era Report: 3062, p. 29, "Inner Sphere -  Map"
- Objectives: Clans, p. 5, "Twycross"
- Jihad: Final Reckoning, p. 43, "Inner Sphere -  Map"
- Field Report: Clans, p. 26, "Clan Jade Falcon/Clan Wolf in Exile Deployment Map - August 3079"
- Jihad: Final Reckoning, p. 63, "Inner Sphere -  Map"
- Field Manual: 3085, p. vii , "Inner Sphere -  Map"
- Map of the Inner Sphere 3130
- Era Report: 3145, p. 10, "Inner Sphere -  Map"
- Era Report: 3145, p. 38, "Inner Sphere -  Map"
- Field Manual: 3145, p. VI, "Inner Sphere -  Map"
- Objectives: Clans, p. 6
- Field Manual: SLDF, p. 255, "SLDF - Lyran Commonwealth Military Command Map"
- Jade Falcon Sourcebook, p. 39, "Second Wave Twycross" - Invasion of Twycross, and its impact on the war.
- Jade Falcon Sourcebook, p. 28, 42, "Fourth Wave: The Falcon Falter" - History and background of fight for FedCom counterassault on Twycross.
- Shattered Sphere, p. 84, "Twycross and Wotan" - Bit piece of Outcome of Trial of Refusal on Twycross.
- Operation Audacity, p.??, Twycross is invaded by Archer Christifori during Falcon Incursion of 3064 and used to catch attention of the Falcons.
- FedCom Civil War, p. 120, "Falcon Incursion" - Events of the Lyran Alliance invasion of Falcon's OZ leads them to Twycross and its falling to the Diamond Sharks.
- Field Manual: Update, p. 58, "Diamond Sharks" - Debt Consolidation - Reaffirming planet takeover and what happened to the Avengers on planet.
- The Wars of Reaving, p. 19
- Field Manual: 3085, p. 115, "Gamma Galaxy"
- Jihad: Final Reckoning, p. 113, "Clan Industry"
- Field Manual: SLDF, p. 255, "SLDF - Lyran Commonwealth Military Command Map"
- The Battle of Twycross, p. 7
- Objective Raids, p. 114, "Unit Note"
- Field Manual: Warden Clans, p. 165, "Warden Clans Deployment Table"
- Objective Raids, p. 30
- Field Report: Clans, p. 8, "Clan Diamond Shark Deployment Status"
- Field Manual: 3085, p. 124, "Deployment Table - 3085"
- Objectives: The Clans, p. 5, "DS Aero Assembly Site Rho"
- Objectives: The Clans, p. 6, "Trellshire Heavy Industries"
- Era Report: 2750
- Era Report: 3052
- Era Report: 3062
- Era Report: 3145
- FedCom Civil War (sourcebook)
- Field Manual: 3085
- Field Manual: 3145
- Field Manual: SLDF
- Field Manual: Update
- Field Manual: Warden Clans
- Field Report: Clans
- First Succession War
- Handbook: House Steiner
- Historical: Liberation of Terra Volume 1
- Historical: Liberation of Terra Volume 2
- Historical: Reunification War
- Historical: War of 3039
- House Steiner (The Lyran Commonwealth)
- Jade Falcon Sourcebook
- Jihad: Final Reckoning
- Jihad Secrets: The Blake Documents
- Map of the Inner Sphere 3130
- Masters and Minions: The StarCorps Dossiers
- Objective Raids
- Objectives: Clans
- Operation Audacity
- Shattered Sphere
- The Battle for Twycross
- The Wars of Reaving