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In the 15th century, during the age of gunpowder when the cannon came to dominate the battlefield, a new style of fortification evolved in Europe. Roughly resembling the shape of a star, these fortifications had many triangular bastions, specifically designed to cover each other, and a wide ditch. In order to counteract the cannon balls, defensive walls were made lower and thicker and were protected by gently sloping banks of earth called glacis in front of ditches so that the walls were almost totally hidden from horizontal artillery fire. The new fortification became so popular that the design was swiftly adopted by other nations as far as India and Japan.
During the Eighty Years' War, the Spaniards had control over Groningen and the road leading from there to Germany. William, the leader of the Netherlands, saw it necessary to break off communications between Groningen and Germany. He decided that it would be optimal to build a fortification on the Bourtange passage, which was the main road leading to Germany. The fort was completed in 1593 in the design of a star with a network of canals and lakes which were used as moats. At its heart was a central square with streets that led directly to various bastions within the protective moat. At the very year of its completion, Spanish forces tried to besiege it but the attack ended in failure.
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Fort Bourtange faced another battle in 1672 against a marauding German army. After capturing 28 cities and towns in the northern Netherlands, they demanded that the Fort be surrendered. Legend states that the Germans offered the fort's governor, Captain Protts, 20,000 guilders to surrender. Captain Prott refused saying he had an equal number of bullets for his foe. The Germans attacked but the fort’s trusted defense once again successfully repelled the attack.
Eventually, in 1851 the fort town of Bourtange was converted into a village. Over 100 years later in 1960, the local government decided to restore the old Fort to its 1740-1750 appearance and made into a historical museum.
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