(References to Ridderkerk)
Note: X and Y are coordinates (light years on XY plane) relative to Terra at (0, 0)
X: -46.24 Y: 353.76[e]
Garrisoning Military Force
- 2596 - Lyran Commonwealth
- 2750 - Lyran Commonwealth
- 3025 - Lyran Commonwealth
- 3030 - Lyran Commonwealth
- 3040 - Federated Commonwealth
- 3052 - Clan Wolf
- 3057 - Clan Wolf
- 3062 - Clan Wolf
- 3130 - No record 
Conquered by Clan Wolf during Operation Revival, Ridderkerk was the subject of a second attempted invasion in October 3071, when forces from Clan Hell's Horses invaded the Clan Wolf occupation zone in the Inner Sphere, attempting to annex planets to form their own holding in Spheroid space. Although the Hell's Horses troops assaulted the Wolf forces on Ridderkerk, they couldn't displace them for long, and Wolves counterattacked at Ridderkerk later that month.
- ↑ 20 Year Update, p. 25, "Federated Commonwealth Deployment Table"
- ↑ Historical: Reunification War, p. 159, "Inner Sphere Map "
- ↑ Map of the Inner Sphere 3130
- ↑ Jihad Hot Spots: 3076, p. 17, "Timeline of the Jihad"
- ↑ Jihad: Final Reckoning, p. 50, "The Jihad In Review"