COBI Knights Fortress 700 Piece Building Block Set When Lego"s patent expired over twenty years ago, many companies jumped in to compete, feeling that they could make a comparable brick, but at a more affordable price. COBI, based in Poland, went one step further. Seeing that Lego avoided any war- and military-based sets, COBI decided to specialize in brick-building sets created around a military or historical theme. Today COBI is the biggest manufacturer of construction blocks in Central and Eastern Europe with an international sales network that expands to over sixty countries worldwide. Manufactured to the same exacting standards as Lego blocks, COBI building sets are focused on real-world scenarios. The Battle of Grunwald or 1st Battle of Tannenberg was fought on July 15, 1410, during the Polish-Lithuanian-Teutonic War. The battle was one of the largest battles in Medieval Europe and is regarded as the most important victory in the history of Poland and Lithuania. Raise the bridge to seal off the fortress from enemy attack. This 700 piece set comes with everything you need to ensure victory on the opposing side. Add additional sets to create your own army!