On Sunday we head off to Amsterdam to start our Viking Rhine River cruise. As it turns out, the Vikings raided up the Rhine repeatedly during the Viking Age, and it’s a genuinely good history to know given our Viking Rhine cruise. In the 9th Century Norse raiders discovered that rivers like the Rhine, Seine, and Meuse gave them a highway straight into the heart of continental Europe. Their shallow-draft longships could sail far upriver, well past where anyone expected seaborne raiders to reach. Rhine raids intensified through the mid-to-late 800s, part of the broader wave of Viking incursions into Frankish territory during the reign of Charlemagne’s successors, when the Carolingian Empire was fracturing and increasingly unable to defend its rivers. Cities along the Rhine and its delta were hit repeatedly. Cologne and other Rhine towns also suffered raids during this period, as did monasteries along the river, which were favorite targets for their portable wealth (precious metals, illuminated manuscripts, coin, bullion and Jewelry…the Monk business was booming). The same qualities that later made the Rhine great for trade, a deep, navigable channel reaching far inland, made it just as good for raiding. The Franks hadn’t built the kind of unified river defense that could stop small, fast, mobile fleets, so Viking bands could strike, pillage, and retreat back downriver before a large enough force could be mustered. Viking Cruise Line borrowed its name directly from this history …“Viking” branding for river cruises is a deliberate nod to the fact that Norse ships were among the first Europeans to really exploit rivers like the Rhine as long-distance travel corridors, just for considerably less peaceful purposes than ours will be. In fact, given Kim’s shopping tendencies, we will be leaving far more value than we will be taking from the Rhine.
Crossing the Rhine has been one of the recurring hinge-points of European military and political history because for most of that history, the river functioned as a natural barrier separating powers on either side. Julius Caesar built the first recorded Rhine bridge in 55 BC, a wooden pile structure completed in just 10 days, mainly as a show of force to intimidate Germanic tribes rather than for permanent use (he tore it down after the campaign). Rome later built more durable crossings and fortified towns (Cologne, Mainz) on the western bank as the river became the empire’s de facto northeastern frontier, the limes Germanicus. Crossing it, for Rome, generally meant venturing into “barbarian” territory. This Roman framing of the Rhine as the line between the Latin/civilized world and the Germanic world, stuck around in the European imagination for centuries, which is part of why later crossings carried outsized symbolic weight, not just military value. In 406 AD, a mass crossing of Vandals, Alans, and Suebi tribes over the frozen or lightly-defended Rhine near Mainz is often cited by historians as a pivotal moment in the collapse of Roman authority in Gaul. Rome could no longer hold the line, and the frontier essentially dissolved. During the Napoleonic era French revolutionary and Napoleonic armies crossed the Rhine repeatedly to invade and later annex German territories, and briefly abolished the old feudal tolls and lordships along the river. The Rhine crossings of this era were as much about redrawing Europe’s political map as about military tactics.
During World War II, the most famous modern crossings of the Rhine occurred. By 1945, the Rhine was the last major natural barrier protecting Germany’s heartland from Allied invasion. At Remagen in March, 1945, US forces captured the Ludendorff Bridge intact (Germans failed to fully demolish it in time), allowing Americans to establish the first bridgehead across the Rhine, a huge, partly accidental strategic windfall. That same month, Operation Plunder was Montgomery’s large, deliberately planned set-piece crossing a bit further north, involving airborne drops (Operation Varsity) and massive artillery support. Patton’s crossing near Oppenheim, was done quickly and with characteristic showmanship, slightly upstaging Montgomery’s more elaborate operation. These crossings effectively opened the German interior to Allied advance and are widely seen as marking the beginning of the end of the war in Europe. Crossing the Rhine became ordinary again after 1945 as the story flips and instead of contested crossings, the Rhine became laced with peacetime bridges, tunnels, and ferries as European integration progressed. Today there are dozens of road, rail, and pedestrian crossings between France, Germany, and Switzerland, symbolically completing the transformation from frontier to connective tissue for the continent.
The Rhine is Europe’s single most important inland trade artery and not just a minor supporting player. It carries roughly 285 million tonnes of freight a year, making it Europe’s busiest inland waterway and the continent’s most important logistics corridor after the open seas. River traffic is essentially constant (on the Lower Rhine near Duisburg, a barge passes roughly every seven minutes, 365 days a year). Germany alone depends on the Rhine for about 80% of its water freight, making it critical to the EU’s largest national economy. Low water from drought like we’ve had this year is a growing risk that forces barges to cut cargo loads by half or more, doubling transport costs, and slowing factory production in Germany when raw materials can’t arrive. The Rhine’s headwaters are fed partly by Alpine glacier and snowmelt, so its long-term flow reliability is itself exposed to the same warming trend.
But we are cruising the Rhine for things like the castles lining the Rhine, especially the Rhine Gorge (Rhein-Gorge) between Koblenz and Bingen, a UNESCO World Heritage site. The history of these castles is basically the toll-extraction story of the river and its trolls taken in physical form. Starting in the High Middle Ages (roughly 1100s–1300s), the Holy Roman Empire was politically fragmented into a patchwork of competing lords, prince-bishops, and petty nobility. The Rhine Gorge, a narrow, high-walled stretch of river with strong currents and tricky navigation, was the perfect chokepoint. Local lords built castles on the cliffs above it specifically to control and tax the river traffic passing below, often extracting tolls at gunpoint (or crossbow-point) by stretching chains across the river to force ships to stop. There are over 40 castles, palaces, and fortifications that line the roughly 65-km Rhine Gorge stretch alone, an extraordinary concentration, which is part of why UNESCO designated it. There’s the Marksburg Castle above Braubach, which is one of the few Rhine castles never destroyed or ruined. It survives essentially intact from medieval times and is often used as the “template” for what a Rhine castle originally looked like. Pfalzgrafenstein is a striking castle built directly in the river on a small island near Kaub, purpose-built as a toll station which ships literally couldn’t pass without stopping there. Then there’s Rheinstein Castle, one of the first to be romantically restored in the 19th century, kicking off a wave of castle restoration/rebuilding. Katz and Maus (Cat and Mouse) Castles are two facing castles near St. Goarshausen, nicknamed for the rivalry between the noble families who built them to out-tax and out-intimidate each other. Loreley Rock is not a castle per se, but the dramatic slate cliff nearby, famous in German folklore for a siren-like maiden said to lure sailors to their deaths on the rocks, a nod to how genuinely treacherous this narrow stretch of river was to navigate. Many castles were destroyed or fell into ruin during the 17th-century Thirty Years’ War and later French campaigns (Louis XIV’s forces deliberately demolished several in the late 1600s to weaken German territorial power). By the 18th century most were picturesque ruins. Ironically, this ruined-castle aesthetic sparked German Romanticism. Poets and painters (and eventually tourists) fell in love with the moody, crumbling-fortress look, and a wave of 19th-century restoration (sometimes more fanciful than historically accurate) rebuilt many into the postcard-perfect castles we will see on our cruise.
A few things converge on the Rhine that few rivers anywhere combine including geography, history, economics, politics and cultural symbolism. The Rhine’s history spans roughly 2,000 years as one of Europe’s defining geographic and political features. It’s evolved from a contested military frontier into the connective tissue of the EU single market, the trade backbone we just discussed, and, fittingly, a symbol of Franco-German reconciliation and European unification rather than division. We’ve done the Danube river cruise so we are pleased to complete the circuit by crossing off the Rhine.