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Note: X and Y are coordinates (light years on XY plane) relative to Terra at (0, 0)
Heligoland neighbouring systems
|X:Y Coordinates||86.076 : -145.054[e]|
- 2366 - Sarna Supremacy 
- 2367 - Capellan Confederation 
- 2571 - Capellan Confederation 
- 2596 - Capellan Confederation 
- 2750 - Capellan Confederation 
- 2764 - Capellan Confederation 
- 2765 - Capellan Confederation 
- 2786 - Capellan Confederation 
- 2822 - Capellan Confederation 
- 2864 - Capellan Confederation 
- 3025 - Capellan Confederation 
- 3029 - Federated Suns (from September/October)
- 3030 - Federated Suns 
- 3040 - Federated Commonwealth 
- 3050 - Federated Commonwealth 
- 3052 - Federated Commonwealth 
- 3057 - Federated Commonwealth 
- 3058 - Chaos March 
- 3063 - Capellan Confederation 
- 3067 - Capellan Confederation 
- 3075 - Capellan Confederation 
- 3079 - Capellan Confederation 
- 3081 - Capellan Confederation 
- 3085 - Capellan Confederation 
- 3130 - Capellan Confederation 
- 3135 - Capellan Confederation 
- 3145 - Capellan Confederation 
Fourth Succession War
Despite ComStar placing the Federated Suns under a communications interdiction after the invasion of Sarna in mid-3029, the Capellan Operations Command of the Armed Forces of the Federated Suns received enough positive reports from the fifth wave of Operation RAT to launch the sixth wave in the second week of August 3029. The decision to launch wave six was in part driven by contact from planetary governments in the unconquered region of the Sarna Commonality, indicating that the perceived threat of being annexed by the Free Worlds League was prompting a groundswell of opinion among those governments that being absorbed by the Federated Suns was a preferable alternative to being conquered by House Marik. The countless raids and invasions by the Free Worlds League Military over the centuries had embedded an intense hatred of House Marik among the planetary populations within the region, and confidence in the Capellan Confederation's ability to defend them was falling.
Heligoland was one of the targets of the sixth wave, with the invasion assigned to the Sixth Crucis Lancers Regimental Combat Team. Defending Heligoland at the time were Kingston's Legionnaires, a medium-weight 'Mech regiment. Rather than assaulting the Lancers' drop zones, the Legionnaires assumed defensive positions in the hills around the planetary capital city, Helio. This presented Marshal Orval Gossiage with a problem, as assaulting a strong enemy in a well-chosen defensive position was a receipe for casualties. When Gossiage's reconnaissance teams confirmed that Helio's only source of water was a reservoir located more than fifty kilometers away, Gossiage ordered the Lancers to capture the reservoir, cut off the water supply to Helio, and wait. Two weeks later, Colonel Martha Mathias of the Legionnaires had no choice but to attack, only for the Legionnaires to be mauled by the Lancers.
Faced with a losing prospect Mathais contacted Gossiage with an offer to withdraw the Legionnaires and the planetary militia off-world, provided a number of set conditions were met. Those conditions revolved primarily around ensuring that the local population were treated fairly, but also included the demand that the Legionnaires and their families be transported to Minnacora, a nearby system still in Capellan hands. Knowing that he was placing his transport ships at risk, Gossiage decided to agree to the terms, and dispatched four DropShips and his two smallest JumpShips to transport the Capellan forces away. Everything went well, and Gossiage's role in preventing further bloodshed on Heligoland was noted by the AFFS, but he was also warned for risking the ships and the lives of their crews.
- Kingston's Legionnaires (until September/October)
- Helio: the planetary capital city.
| Systems within 60 light-years (distance in light years)|
Closest systems first:
|New Aragon||59.76||Second Try||59.91|
- Handbook: House Liao, p. 17, "Capellan Confederation Founding - "
- Handbook: House Liao, p. 13, "Timeline: Capellan Zone 2367"
- Handbook: House Liao, p. 25, "Capellan Confederation after Age of War -  Map"
- Historical: Reunification War, p. 159, "Inner Sphere -  Map"
- Era Report: 2750, p. 37, "Inner Sphere -  Map"
- Field Manual: SLDF, p. vii, "Inner Sphere -  Map"
- Historical: Liberation of Terra Volume 1, p. 11, "Inner Sphere - 2765"
- First Succession War (Source Book), pp. 24-25, "Inner Sphere -  Map"
- Handbook: House Liao, p. 31, "Capellan Confederation after First Succession War - [2822 Map]"
- Historical: Liberation of Terra Volume 2, p. 122-123, "Inner Sphere -  Map"
- First Succession War (Source Book), pp. 112-113, "Inner Sphere -  Map"
- Handbook: House Liao, p. 39, "Capellan Confederation after Second Succession War -  Map"
- Handbook: House Liao, p. 40, "Capellan Confederation after Third Succession War -  Map"
- NAIS The Fourth Succession War Military Atlas Volume 2, p. 51, "Sixth Wave"
- NAIS The Fourth Succession War Military Atlas Volume 2, p. 52, "Heligoland"
- Handbook: House Liao, p. 49, "Capellan Confederation after Fourth Succession War -  Map"
- Historical: War of 3039, p. 133, "Inner Sphere -  Map"
- Era Report: 3052, p. 10, Inner Sphere -  Map
- Era Report: 3052, p. 22, Inner Sphere -  Map
- Era Report: 3062, p. 11, "Inner Sphere -  Map"
- Handbook: House Liao, p. 60, "Capellan Confederation after Operation Guerrero -  Map"
- Era Report: 3062, p. 29, "Inner Sphere -  Map"
- Handbook: House Liao, p. 68, "Capellan Confederation after FedCom Civil War -  Map"
- Jihad: Final Reckoning, p. 43, "Inner Sphere -  Map"
- Jihad Secrets: The Blake Documents, p. 64, "Inner Sphere -  Map"
- Field Report: CCAF, p. 21, "Capellan Confederation Armed Forces 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. 11, "Inner Sphere -  Map"
- Era Report: 3145, p. 39, "Inner Sphere -  Map"
- Field Manual: 3145, p. VI, "Inner Sphere -  Map"
- House Liao (The Capellan Confederation), p. 105, "Unit Deployment Table"
- Era Report: 2750
- Era Report: 3052
- Era Report: 3062
- Era Report: 3145
- Field Manual: 3085
- Field Manual: 3145
- Field Manual: SLDF
- Field Report: CCAF
- First Succession War
- Handbook: House Liao
- Historical: Liberation of Terra Volume 1
- Historical: Liberation of Terra Volume 2
- Historical: Reunification War
- Historical: War of 3039
- House Liao (The Capellan Confederation)
- Jihad: Final Reckoning
- Jihad Secrets: The Blake Documents
- Map of the Inner Sphere 3130
- NAIS The Fourth Succession War Military Atlas Volume 2