From the website:
The River Rhine provided Germany with not only a natural barrier to its enemy in the west but also an important psychological one. As the Allies closed in on the Rhine in March 1945, Germany forces begun destroying all the bridges across the river. By a stroke of luck, American forces were able to capture the intact rail bridge at Remagen. Quickly taking advantage of their good fortune, the Allies established a bridgehead on the Germany side of the river; giving them a much need psychological boost and a foothold into Germany.