When the Navy of Masada attacked Yeltsin's Star, Hill ordered his collector ships to leave the station. The station was destroyed by the Masadans before the First Battle of Yeltsin's Star. There were no vessels that could defend the station, and the station was left to defend itself. Orbital Four was able to get a salvo of missiles off at the attackers; MNS Abraham, the Masadan flagship, was destroyed.
None of the other orbital stations were able to duplicate Orbital Four's success. The closing of the missile range was considered a strategic move by the Masadans. (HH2)