According to Tolkien, he had long been interested in developing artificial languages, but soon discovered that if the languages he was inventing were to be like real languages, a history to go with them was necessary, to produce metaphors. Originally Tolkien wrote a series of stories about a mythological, flat-earth version of Earth partly derived from his knowledge of Norse legend and other mythologies. When he wrote the fairy tale “The Hobbit”, parts of it leaked through.
When “The Hobbit” was a success, and Tolkien's publisher was not interested in what was submitted of Tolkien's earlier writings but very much interested in a sequel to “The Hobbit'', Tolkien produced “The Lord of the Rings” which was very much inspired by his earlier mythological tales and was understood, by him, to be a sequel also to those tales. Tolkien was also influenced by things he had experience, such as a walking trip across Europe and the tragedy of the First World War. The Orcs were partly inspired by the Huns of popular tradition, especially those of Gibbon’s “The Decline and Fall of the Roman Empire”.
The Rohirrim were in part inspired by Germanic peoples who joined with Rome in its last days. The style of his two Elvish languages were inspired by the feel and sounds of Finnish (for Quenya) and Welsh (for Sindarin). Tolkien was not at all inspired by Lewis’ Narnia books, which were not begun until after “The Lord of the Rings” was completed.
Tolkien at one time had very much liked the magical tales of George MacDonald and there is a similar feel in part of his writing. One may also find a similar feel to some of the fantasy writings of William Morris. Tolkien’s own religion, Roman Catholicism, also very much influenced him.
The reason I think you seen allusions to Narnia is because Tolkien (writing in the late 30's) and Lewis (writing in the 40's) were both inspired by their religious belief. The lord of the rings trilogy is a loose allegory for Christianity and the Bible. I doubt Tolkien was trying to spread the word, but he was definitely religious and the books are definitely allegorical.
As a side note, I'm pretty sure Tolkien criticized Lewis' Narnia books for being TOO clearly allegories for the Bible. Tolkien is also credited with creating one of the first fully imaginative worlds. That is one that had no ties to the real world, explanations as being Fairy, or supernatural.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.