Divide and Rule/The Sword of Rhiannon

A set of kangaroo like aliens have taken over Terra. but our hero uses the feudal system the aliens have imposed on the humans to eventually, free us all. amusing, on ocasion.

L. Sprague de Camp's fun novella was first published in Astounding, in 1939, and should be read in the light of those times. The world was different then.

I spent hours last night, and this morning, trying to decipher when Leigh Brackett's "The Sword of Rhiannon" was first published, and where. I found things I already knew (such as that this is also known by the title "Sea-Kings of Mars" (and this may have been the original title). I find the original copyright in 1953, by ace books, but maddeningly, it does not say which book it is in. There are already several well-written reviews of this:

http://www.librarything.com/work/128320/reviews