The biggest batterie on the island, and one of four in the La Houguette area, is on private land and looked after by the group which is passionate about Second World War fortifications.
Because islanders cannot usually access the site, the open days are often incredibly popular and on Saturday some 2,500 turned up.
Steve Powell, project co-ordinator at Festung Guernsey, was very pleased with the turn-out and said feedback from islanders had been very positive.
‘Just looking around at how many people are here to learn about Guernsey’s history and to support Festung Guernsey is amazing,’ he said.
‘It’s encouraging us to do more, for sure.’
Twelve members of the team were on site, with six experts situated around the batterie to answer any questions and explain the history and function of each room inside.
Nine-year-old William Weeks and 11-year-old Marley Edmunds were surprised how big the batterie was on the inside.
It was their first time at Batterie Mirus and they said it was very cool to see the things that they had learned about in history classes at school.
Lillia Le Cras, 6, enjoyed exploring the inside and said her favourite bit was seeing the German markings that were left on the walls.
One little boy who was very excited to get inside was three-year-old Jacob Alderton.
His mum, Natalie, said Jacob has always been interested in Guernsey history.
‘Whenever I ask him what he wants to do, it’s never go to the park, it’s always go to the bunkers,’ she said.
It was Jacob’s first time at Batterie Mirus and quickly turned into one of his favourite spots on the island.
Andre and Roy Ferbrache were impressed with how much research had been done on the site.
‘It’s great to see the information boards and old photographs of the batterie in operation,’ Roy said.
‘We knew nothing about it when we first got here but it is very impressive and a great thing to be able to come and see.’
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