Question: Why did Tolkien dislike the title of his book "The Return of the King"
About the article "The Lord of the Rings", section "Publication history".

Candidate passages:
Tolkien conceived of "The Lord of the Rings" as a single volume comprising six "books" plus extensive appendices.
The original publisher split the work into three, publishing the fifth and sixth books with the appendices under the title "The Return of the King".
Tolkien felt the chosen title revealed too much of the story, and indicated he preferred "The War of the Ring" as a title.
The proposed title for Book V was "The War of the Ring".
Book VI was to be "The End of the Third Age".
These titles were used in the "Millennium edition".
"The Return of the King" was in the end published as the third and final part of "The Lord of the Rings", on 20 October 1955. 
"The Return of the King" is the twelfth episode of the 2006 "Robin Hood" television series, made by Tiger Aspect Productions for BBC One.
It aired on Saturday December 23, 2006.
Its title punningly refers to the Tolkien book "The Return of the King".
It is the first part of the first series' only two-parter. 
A dispute with his publisher, George Allen & Unwin, led to the book being offered to Collins in 1950.
Tolkien intended "The Silmarillion" (itself largely unrevised at this point) to be published along with "The Lord of the Rings," but A&U were unwilling to do this.
After Milton Waldman, his contact at Collins, expressed the belief that "The Lord of the Rings" itself "urgently wanted cutting", Tolkien eventually demanded that they publish the book in 1952.
Collins did not; and so Tolkien wrote to Allen and Unwin, saying, "I would gladly consider the publication of any part of the stuff.
"For publication, the book was divided into three volumes: "The Fellowship of the Ring" (Books I, "The Ring Sets Out", and II, "The Ring Goes South"), "The Two Towers" (Books III, "The Treason of Isengard", and IV, "The Ring Goes East"), and "The Return of the King" (Books V, "The War of the Ring", and VI, "The End of the Third Age", plus six appendices).
This was due largely to post-war paper shortages, as well as being a way to keep down the price of the book.
Delays in producing appendices, maps and especially indices led to the volumes being published later than originally hoped — on 21 July 1954, on 11 November 1954 and on 20 October 1955 respectively in the United Kingdom, and slightly later in the United States.
"The Return of the King" was especially delayed.
Tolkien, moreover, did not especially like the title "The Return of the King", believing it gave away too much of the storyline.
He had originally suggested "The War of the Ring", which was dismissed by his publishers.
The books were published under a profit-sharing arrangement, whereby Tolkien would not receive an advance or royalties until the books had broken even, after which he would take a large share of the profits.
It has ultimately become the second best-selling novel ever written, with over 150 million copies sold.
Only "A Tale of Two Cities" by Charles Dickens has sold more copies worldwide (over 200 million) while the fourth best-selling novel is Tolkien's "The Hobbit".
Ohlmarks translation of Tolkien's "The Lord of the Rings" was strongly disliked by the author, prompting him to compile his "Guide to the Names in The Lord of the Rings".
Ohlmarks not just invented many expression of his own, but also took great liberties with the contents of Tolkien's work, both by shortening many parts of it and by inserting his own interpretations.
Tolkien was also dissatisfied by the title "Sagan om ringen", "The Saga of the Ring".
As a result of the severe criticism directed against his translation of "The Lord of the Rings", both by Tolkien himself and by Swedish Tolkien fandom, Ohlmarks in the late 1970s began to display hostility towards the "Tolkien phenomenon", and in 1982 published a book titled "Tolkien and Black Magic,"expounding a conspiracy theory connecting Tolkien and Tolkien fandom with Nazi occultism.
Despite the criticism and controversy, Ohlmarks's translations remained the only Swedish-language translations of "The Lord of the Rings" until 2004. 
Each volume of "The History of Middle-earth" bears on the title pages an inscription by Christopher Tolkien in Fëanorian letters (in Tengwar, an alphabet Tolkien devised for the High-Elves), that describes the contents of the book.
The inscription in Book XII reads: "This is the last volume of the work of Christopher Tolkien in which he has collected a great part of all that his father John Ronald Reuel Tolkien wrote of Middle-earth and Valinor.
In this book is traced the devising of the history of the later ages in the Northwest of Middle-earth after the Great Battle and the Fall of Morgoth."