Parameters off?
The original premise...
Greatest feat of military engineering in the twentieth century.
Clarification needed.
Are we talking engineering for the military or by the military, such as Combat Engineers or Seabees?
The Romans developed a method of building driven pile bridges over rivers that is still used today in one form or another.
Like the Baily bridge which wasn't really developed or engineered by the military. Just a private contractor who engineered the thing to military supplied specs.
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