When the Vanguard first began their attack on the Elroy Family Zeff was Rheinhal he tried to fight his way out but only Axiolis escaped. When Dunstan and his cohorts attempted to kidnap Cisco and Emiliana they managed to capture Cisco and his reaper. The Rainlords mobilized to rescue them and deal a strike against the Vanguard simultaneously.
While the Rainlords attacked Parson ordered one of his subordinates to free Zeff Elroy and his son but only managed to free Zeff.
The siege failed primarily due to Sanko's interference.