Youngsters are invited to help defend the Victorian Fort Nelson, near Fareham, with gun drills and marching practice in a series of half-term events this week.
From today until Friday, visitors can explore the tunnels, ramparts and fortifications and discover how to defend the fort.
There will be gun drills at 11am, midday, 2pm and 3pm for children, as well as a daily gun firing at 1pm on the parade.
Special free insight talks will take place at 12.30pm and 3pm and youngsters can discover what life was like for the soldiers and navvies who lived and worked at Fort Nelson, in interactive handling sessions.
The gun drills are suitable for children aged five to 12. They must be accompanied by adults.
Each session lasts 45 minutes and tickets cost £3.50 and are available from the main reception desk.
Entry to the fort is free, with parking and an excellent café on site.
For more details visit royalarmouries.org