|The following is based on Fallout Tactics and some details might contradict canon.|
Freeport, a town in the state of Illinois, was largely destroyed during the Great War. By 2197, the town became a rather large raider den, housing limited supplies of fossil fuels and a large alcohol distillery.
Cypher, a raider who was also working as a Brotherhood informant, revealed where Charon was kept. A squad of Brotherhood initiates who have previously freed Brahmin Wood of raiders manage to rescue Charon, killing many unsuspecting raiders (including the camp leader, O'Reilly) in the process. Another prisoner, Ripley, from Great Bend, was also saved.
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The mission in Freeport is a stealth mission. You need to ensure that Charon is unharmed, then kill as many raiders as possible and help Charon escape.
You don't actually have to talk to the informant to complete the mission.
Freeport appears only in Fallout Tactics.