Caesar's Rhine bridges

Deutsch: Caesars Rheinbrücken waren zwei römische Militärbrücken, die in den Jahren 55 bzw. 53 v. Chr. von Gaius Julius Caesar in der Nähe von Koblenz (Deutschland) über den Rhein geschlagen wurden.

English: Caesar's Rhine bridges were two Roman military bridges across the Rhine, which were built by Gaius Julius Caesar near Koblenz, Germany, in 55 and 53 BC respectively.

日本語: 「カエサルのライン架橋」:ガリア戦争中のBC55年とBC53年にガイウス・ユリウス・カエサルがライン川に架けた桁橋

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Caesar's construction process of Rhine bridges

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  Caesar joined together at the distance of two feet, two piles, each a foot and a half thick, sharpened a little at the lower end, and proportioned in length, to the depth of the river.
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  After he had sunk these into the river, and fixed them at the bottom, and then driven them in , not quite perpendicularly, dike a stake, but bending forward and sloping, so as to incline in the direction of the current of the river; he also placed two [other piles] opposite to these, at the distance of forty feet lower down, fastened together in the same manner, but directed against the force and current of the river.
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  These beams were bound together by timber laid over them, in the direction of the length of the bridge, and were then covered over with laths and hurdles; and in addition to this, piles were driven into the water obliquely, at the lower side of the bridge, and these, serving as buttresses, and being connected with every portion of the work, sustained the force of the stream:
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  longitudinal section
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  with brace version
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  with brace version
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  longitudinal section (with crossed stakes version)