Did a tour with a local group of some of the WW1 sites with a professional guide a couple of years ago. He completed the weekend by taking us on a trip to the Dunkirk beaches visiting and describing various events and places on the way. We went to the large Commonwealth cemetery in Dunkirk also...
From what I've seen and read weren't the actual guns found further inland after the attack by the US Rangers. They hadn't been put in their emplacements.