soc.history.war.world-war-ii - join
History & events of World War Two. (Moderated)
Medium activity, 925 subscribers, Usenet

soc.history.ancient - join
Ancient history (up to AD 700).
High activity, 803 subscribers, Usenet

soc.history.medieval - join
The historic period of the middle ages.
High activity, 723 subscribers, Usenet