The real guns

 

The Guns of Navarone (both a book and a movie) weren't real. 

But there were guns like them, as reported here. And they had to be captured and neutralized so they couldn't fire at Allied ships. So I add this to my list of things I didn't know before I read this, but I am happy that I know this now.

The REAL Guns of Navarone: Author DAMIEN LEWIS reveals how Paddy Mayne's SAS triumphed in 1943 mission to blow up Nazi shore guns in Sicily while outnumbered 50 to ONE

One of the guns, after being captured.