In
military strategy
Military strategy is a set of ideas implemented by military organizations to pursue desired strategic goals. Derived from the Greek word '' strategos'', the term strategy, when it appeared in use during the 18th century, was seen in its narrow s ...
, a bridgehead (or bridge-head) is the strategically important area of ground around the end of a bridge or other place of possible crossing over a body of water which at time of conflict is sought to be defended or taken over by the belligerent forces.
Bridgeheads typically exist for only a few days, the invading forces either being thrown back or expanding the bridgehead to create a secure defensive
lodgement
A lodgement is an enclave, taken and defended by force of arms against determined opposition, made by increasing the size of a bridgehead, beachhead, or airhead into a substantial defended area, at least the rear parts of which are out of direc ...
area, before breaking out into enemy territory, such as when the
U.S. 9th Armored Division
The 9th Armored Division (the "Phantom Division") was an armored division of the United States Army during World War II. In honor of their World War II service, the 9th was officially nicknamed the "Phantom Division."
The 9th Armored Divi ...
seized the
Ludendorff Bridge
The Ludendorff Bridge (sometimes referred to as the Bridge at Remagen) was in early March 1945 a critical remaining bridge across the river Rhine in Germany when it was captured during the Battle of Remagen by United States Army forces durin ...
at
Remagen
Remagen ( ) is a town in Germany in the state of Rhineland-Palatinate, in the district of Ahrweiler. It is about a one-hour drive from Cologne, just south of Bonn, the former West German capital. It is situated on the left (western) bank of the ...
in 1945 during
World War II
World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
. In some cases a bridgehead may exist for months.
Etymology
''Bridgehead'' (
French ''tête de pont'') is a
High Middle Ages
The High Middle Ages, or High Medieval Period, was the periodization, period of European history that lasted from AD 1000 to 1300. The High Middle Ages were preceded by the Early Middle Ages and were followed by the Late Middle Ages, which ended ...
military term, which before the invention of cannons meant the military
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'' ...
that protects the end of a
bridge
A bridge is a structure built to span a physical obstacle (such as a body of water, valley, road, or rail) without blocking the way underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually somethi ...
. Like many older terms, the meaning of the word drifted with the passage of time, becoming used for something not exactly true to its initial usage.
With the introduction of cannons, the term was morphed to a generalized term for field fortifications lying some distance beyond the ends of the bridge that were emplaced to protect both the bridge and any troops crossing it to the far bank, so became in that era a term used when referring to both the fortifications and the small lodgement on the bank that was closest to the enemy. As the process of moving an army over bridges is slow and complicated, it is usually necessary to secure it from hostile interruption, and the works constituting the bridge-head must therefore be sufficiently far advanced to keep the enemy's artillery out of range of the bridges—hence as artillery grew in power, so did the size of the lodgements necessary. In addition, room is required for the troops to form up on the farther bank. Formerly, with short-range weapons, a bridgehead was often little more than a screen for the bridge itself, but modern conditions have rendered necessary far greater extensions of bridge defenses.
Then armies and military formations grew, so needed more lodgement area to organize a force large enough to stage a break out against a determined enemy, and again the technical meaning of the term expanded, again referring to a large fortified area about at bridge end. With the advent of modern warfare capabilities, including long-range tube artillery and high-powered rifles with effective ranges measured in the thousands of yards (metres), the term of art again had to expand in area, but now morphed to be just an area defended and controlled by ample firepower, with or without constructed fortifications.
The term in colloquial usage refers to any kind of defended area that is extended into hostile territory – also called a