Upon his return to England, Brooke received a fellowship at King's College and spent time in both Cambridge and London. In 1912 he compiled an anthology entitled Georgian Poetry, 1911-12, with Edward Marsh. The Georgian poets wrote in an anti-Victorian style, using rustic themes and subjects such as friendship and love. While critics viewed Brooke's poetry as too sentimental and lacking depth, they also considered his work a reflection of the mood in England during the years leading up to World War I.
After experiencing a mental breakdown in 1913, Brooke traveled again, spending several months in America, Canada, and the South Seas. During his trip, he wrote essays about his impressions for the Westminster Gazette, which were collected in Letters From America (1916). While in the South Seas, he wrote some of his best poems, including "Tiare Tahiti" and "The Great Lover." He returned to England at the outbreak of World War I and enlisted in the Royal Naval Division. His most famous work, the sonnet sequence 1914 and Other Poems, appeared in 1915. Later that year, after taking part in the Antwerp Expedition, he died of blood poisoning from a mosquito bite while en route to Gallipoli with the Navy. He was buried on the island of Skyros in the Aegean Sea. Following his death, Brooke, who was already famous, became a symbol in England of the tragic loss of talented youth during the war.