Here is a good solid video, loaded with information about the life of J. R. R. Tolkien, with an emphasis on his participation in World War I.
The many ways that war influenced Tolkien’s work.
The Great War Channel on YouTube led by Indiana Neidell focuses on all things and people related to World War I and in this episode he delves into the life of the younger Tolkien.
“John Ronald Reuel Tolkien (JRR Tolkien) served on the Western Front of World War 1. It is believed that his experiences of the horrors war were a direct inspiration for his Lord of the Rings-Books. The struggle between good and evil and the price for victory are strong motives in his work. Find out which other similarities there are between the Lord of the Rings and the First World War.”