History of Luxembourg

The city, because of its location and natural geography, has through history been a place of strategic military significance. The first fortifications were built as early as the 10th century. By the end of the 12th century, as the city expanded westward around the new St. Nicholas Church (today the cathedral of Notre Dame), new walls were built that included an area of 5 hectares (12 acres). In about 1340, under the reign of John the Blind, new fortifications were built that stood until 1867.

In 1443, the Burgundians under Philip the Good conquered Luxembourg. Luxembourg became part of the Burgundian, and later Spanish and Austrian empires (See Spanish Netherlands and Spanish road) and under those Habsburg administrations Luxembourg Castle was repeatedly strengthened so that by the 16th century, Luxembourg itself was one of the strongest fortifications in Europe. Subsequently, the Burgundians, the Spanish, the French, the Spanish again, the Austrians, the French again, and the Prussians conquered Luxembourg.

In the 17th century, the first case mates were built; initially, Spain built 23 km (14 mi) of tunnels, starting in 1644. These were then enlarged under French rule by Marshal Vauban, and augmented again under Austrian rule in the 1730s and 1740s.

During the French Revolutionary Wars, the city was occupied by France twice: once, briefly, in 1792–3, and, later, after a seven-month siege. Luxembourg held out for so long under the French siege that French politician and military engineer Lazare Carnot called Luxembourg "the best fortress in the world, except Gibraltar", giving rise to the city's nickname: the 'Gibraltar of the North'.

Nonetheless, the Austrian garrison