The siege of Luxembourg was a siege

Siege

A siege is a military blockade of a city or fortress with the intent of conquering by attrition or assault. The term derives from sedere, Latin for "to sit". Generally speaking, siege warfare is a form of constant, low intensity conflict characterized by one party holding a strong, static...

 by France

French First Republic

The French First Republic was founded on 22 September 1792, by the newly established National Convention. The First Republic lasted until the declaration of the First French Empire in 1804 under Napoleon I...

 of the Habsburg

Habsburg Monarchy

The Habsburg Monarchy covered the territories ruled by the junior Austrian branch of the House of Habsburg , and then by the successor House of Habsburg-Lorraine , between 1526 and 1867/1918. The Imperial capital was Vienna, except from 1583 to 1611, when it was moved to Prague...

-held fortress of Luxembourg City that lasted from 1794 until 7 June 1795, during the French Revolutionary Wars

French Revolutionary Wars

The French Revolutionary Wars were a series of major conflicts, from 1792 until 1802, fought between the French Revolutionary government and several European states...

. Although the French army failed to breach the walls of the city, which were renowned as amongst the best in the world, the fortress was forced to surrender after more than seven months.

Luxembourg's long defence led Lazare Carnot

Lazare Carnot

Lazare Nicolas Marguerite, Comte Carnot , the Organizer of Victory in the French Revolutionary Wars, was a French politician, engineer, and mathematician.-Education and early life:...

 to call Luxembourg "the best [fortress] in the world, except Gibraltar", giving rise to the city's nickname 'the Gibraltar of the North

Gibraltar of the North

The 'Gibraltar of the North' is an historical nickname for Luxembourg City, the capital of Luxembourg. It refers to the city's coveted former fortifications, and the fortress' importance to the control of the Left Bank of the Rhine and the approaches between France and Germany...

'.

The result of the capture of Luxembourg was the annexation

Annexation

Annexation is the de jure incorporation of some territory into another geo-political entity . Usually, it is implied that the territory and population being annexed is the smaller, more peripheral, and weaker of the two merging entities, barring physical size...

 of the Southern Netherlands

Southern Netherlands

Southern Netherlands were a part of the Low Countries controlled by Spain , Austria and annexed by France...

 into France on 1 October 1795. Most of Luxembourg

Luxembourg

Luxembourg , officially the Grand Duchy of Luxembourg , is a landlocked country in western Europe, bordered by Belgium, France, and Germany. It has two principal regions: the Oesling in the North as part of the Ardennes massif, and the Gutland in the south...

 (including all of the modern Grand Duchy), became a part of the département of Forêts

Forêts

Forêts was a département of the French First Republic, and later the First French Empire, in present Belgium, Luxembourg and Germany. Its name, meaning 'forests', comes from the Ardennes forests. It was formed on 24 October 1795, after the Southern Netherlands had been annexed by France on 1...

, which was created on 24 October 1795.