The Guns of Navarone (novel)

The Guns of Navarone is a 1957 novel about the Second World War by Scottish writer Alistair MacLean that was made into the film The Guns of Navarone in 1961. The Greek island of Navarone does not exist and the plot is fictitious; however, the story takes place within the real historical context of the Dodecanese Campaign, the Allies' campaign to capture the German-held Greek islands in the Aegean Sea in 1943. The story is based on the Battle of Leros, and Leros island's coastal artillery guns -- among the largest naval artillery guns used during World War II -- that were built and used by the Italians until Italy capitulated in 1943 and subsequently used by the Germans until their defeat.

Question: is the guns of naverone a true story
Answer: no