fortification
A fortification is a military construction or building designed for the defense of territories in warfare, and is also used to establish rule in a region during peacetime. The term is derived from Latin ''fortis'' ("strong") and ''facere'' ...
Basque Country
Basque Country may refer to:
* Basque Country (autonomous community), as used in Spain ( es, País Vasco, link=no), also called , an Autonomous communities of Spain, autonomous community of Spain (shown in pink on the map)
* French Basque Country o ...
,
Spain
, image_flag = Bandera de España.svg
, image_coat = Escudo de España (mazonado).svg
, national_motto = ''Plus ultra'' (Latin)(English: "Further Beyond")
, national_anthem = (English: "Royal March")
, i ...
Spanish Civil War
The Spanish Civil War ( es, Guerra Civil Española)) or The Revolution ( es, La Revolución, link=no) among Nationalists, the Fourth Carlist War ( es, Cuarta Guerra Carlista, link=no) among Carlists, and The Rebellion ( es, La Rebelión, lin ...
to help defend the city from the
Nationalist
Nationalism is an idea and movement that holds that the nation should be congruent with the state. As a movement, nationalism tends to promote the interests of a particular nation (as in a group of people), Smith, Anthony. ''Nationalism: The ...
forces approaching as part of their War in the North campaign.
The Iron Ring was a vast
labyrinthine
In Greek mythology, the Labyrinth (, ) was an elaborate, confusing structure designed and built by the legendary artificer Daedalus for King Minos of Crete at Knossos. Its function was to hold the Minotaur, the monster eventually killed by the ...
fortification network around Bilbao, consisting of
bunkers
A bunker is a defensive military fortification designed to protect people and valued materials from falling bombs, artillery, or other attacks. Bunkers are almost always underground, in contrast to blockhouses which are mostly above ground. T ...
, tunnels, and fortified trenches in several rings, protected by
artillery
Artillery is a class of heavy military ranged weapons that launch munitions far beyond the range and power of infantry firearms. Early artillery development focused on the ability to breach defensive walls and fortifications during siege ...
. However, despite the extensive coverage, it was an antiquated defence concept similar to
First World War
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
fortifications, which made it vulnerable to modern warfare weapons of the time, such as
aircraft
An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines ...
and artillery. Additionally, the fortifications were designed to hold 70,000 troops but were eventually only held by 30,000, less than half conceived to defend it.
In February 1937, the monarchist engineer that coordinated the works,
Alejandro Goicoechea
Alejandro Goicoechea Omar (his first surname is also spelled Goikoetxea) (23 March 1895 - 30 January 1984) was a Spanish engineer.
Biography
Goicoechea worked for the remote coal narrow gauge railway of La Robla (León), the longest narrow gaug ...
, crossed to the Nationalist side carrying plans and documentation.
Therefore, the Iron Ring was easily overcome by Nationalist forces in the
Battle of Bilbao
The Battle of Bilbao, part of the War in the North in the Spanish Civil War, saw the Nationalist Army capture Bilbao and the rest of the Basque Country that was still being held by the Republic.
Background
Bilbao was the capital of the autono ...
when it was breached by an infantry
assault
An assault is the act of committing physical harm or unwanted physical contact upon a person or, in some specific legal definitions, a threat or attempt to commit such an action. It is both a crime and a tort and, therefore, may result in crim ...
supported by heavy air and artillery bombardment from 150 guns and 70 bombers, and the system was completely defeated within two days. Josu Chueca «Burdin Gerrikoa puskatuta» ''36ko Gerra orain''. Imanol Villa ''El Correo'', 2007-02-11.