page_title: Bridge
section_title: Military bridge
hierarchical_section_title: Bridge / Types of bridges / Military bridge
caption_attribution_description: Photo d'un Alvis Unipower Tank Bridge Transporter English: Alvis Unipower TBT (Tank Bridge Transporter) of the British army.
context_page_description: A bridge is a structure built to span a physical obstacle, such as a body of water, valley, or road, without closing the way underneath. It is constructed for the purpose of providing passage over the obstacle, usually something that is otherwise difficult or impossible to cross. There are many different designs that each serve a particular purpose and apply to different situations. Designs of bridges vary depending on the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, the material used to make it, and the funds available to build it.
  Most likely the earliest bridges were fallen trees and stepping stones, while Neolithic people built boardwalk bridges across marshland. The Arkadiko Bridge dating from the 13th century BC, in the Peloponnese, in southern Greece is one of the oldest arch bridges still in existence and use.
context_section_description: The Tank bridge transporter (TBT) has the same cross-country performance as a tank even when fully loaded. It can deploy, drop off and load bridges independently, but it cannot recover them.
caption: Tank bridge transporter of the United States Army. These are mobile bridges; tanks and other vehicles can use them to cross certain obstacles.
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