Julius Caesar, having arrived on the left bank of the Rhine, has his engineers build a bridge over the river which is completed in just ten days; as soon as he crosses the river with 40,000 soldiers, the Germans, superior in strength by a factor of 10, retreat to the hills, impressed by Roman military technology; the Roman legions will patrol the German territories practically undisturbed for 18 days, then Caesar recrosses the Rhine and has the bridge dismantled.
