An old Arthurian children's retelling from the early 20th century, "King Arthur's Knights" by Henry Gilbert, is back in print, part of a line of children's classics put out by Arcturus Holdings Limited. Originally published in 1911, it's been fairly rare - I first discovered it in a school library when I was thirteen, though since it was a school I was visiting at the time and not enrolled in, I couldn't check it out. It stood out to me, though, particularly since it had a strong fantasy element with a spooky tone (including scenes such as Merlin projecting a shadowy image of himself to alert Arthur to the war preparations of the eleven kings he's observing) and some "historical Arthur" elements with Saxon invaders and decaying Roman ruins. (Gilbert made one surprising twist, placing the familiar twelve battles of Arthur near the end of his reign. The Saxons take advantage of the initial civil war between Arthur and Lancelot to renew their attacks on Britain, until the Church intervenes, here assisted by a concerned Sir Geraint - though an outraged Gawain makes some sneering remarks about Geraint's old tendency to stay home with Enid. In the period between Lancelot's exile to Gaul and Arthur and Gawain's expedition to invade his lands, Arthur drives back the Saxons, and the twelve battles occur at this point.) The reprint also contains Walter Crane's illustrations.

I'm pleased to report that the reprint kept the archaic style of Gilbert's book intact, with no attempt to modernize it. (It altered the book's title though, to "Tales of King Arthur".) It's worth looking out for (you'll most likely find it in the "children's classics" section of the bookstore).