Sauron Defeated is volume 9 of 12 in The History of Middle-earth, dask - it chronicles just about everything written by JRRT from the conception of The Hobbit to the end of LotR in volumes 6-9, plus all the other stuff that JRRT wrote about his creation, including all the drafts, blind alleys, changes in names and history of the characters - for example, one of the early versions has Bingo Bolger-Baggins meeting up with Trotter, the Ranger, who is a hobbit with wooden feet...Nine volumes? What's been going on besides all that ring stuff?
Most of The History of Middle-earth's 12 volumes deals with Tolkien's wrestlings with his First Age materials. Three of the volumes chronicle the composition of The Lord of the Rings. Two unfinished novels, the Lost Road and The Notion Club Papers, are provided. Late volumes in the set have some interesting musings by Tolkien on LotRian matters such as the origin of the Orcs.Nine volumes? What's been going on besides all that ring stuff? Anyway, sounds like it could have been a ripping good yarn.