The Roman Empire built a border fort at Rigomagus (or Ricomagus), west of the Rhine. This was about 12 miles north of the site of the first bridge ever built across the Rhine (at Neuwied). This bridge fought the river current by being built on timbers which were driven into the bed at a slant. Caesar's troops spent nearly three weeks on the east side of the river, then crossed back over, destroying the bridge to prevent its use by German raiders. A second bridge was likewise destroyed by the builders once they were through with it.