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Published 18:48 19 Jan 2016 GMT
Updated 09:37 20 Jan 2016 GMT

Together with a drawbridge and strong cardboard walls, it stands 3 metres in height and took them 7 hours to construct. They used 80 glue sticks to construct the fortress, and made over 480 bricks to adorn the walls.
You can watch them construct it here:
Fair play to you lads. Now, we're off to build our own fort in Her.ie.
Thanks to Karl Young for sending this our way - if you have something you think our readers would love, hit us up at hello@her.ie or find us on Facebook or Twitter.Explore more on these topics: