The Fortress series is back by popular demand, with Fortress 108 – Germany’s East Wall in World War II hitting the shelves on 20 July. To celebrate we are having a little competition; we want you, our faithful fans, to show us your architectural prowess and build a fort. You can make it out of anything – pillows, bricks, wood, Lego or perhaps even use some fantastic Osprey books!

Here's our effort to get you started! A formidable sight, yet still it manages to maintain a certain sense of majesty.

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Snap a photo of your best efforts and send them to [email protected]. Three lucky winners will each get a copy of Fortress 108 – Germany’s East Wall in World War II, with the most imaginative fortification also earning a copy of our 2016 Military History Calendar!

The closing date for this competition is July 31st 2015. Winners will be announced the following week!