Passengers were reunited with the boat near Kehl after it was cleared by authorities. It has resumed its itinerary and is now sailing toward Amsterdam.
"Because of our fleet size there will be a higher number of minor incidents that occur during the course of the sailing season," a spokesman said. "Viking takes these incidents very seriously, and the safety of our passengers and crew is our top priority.
Passengers were transferred from Viking Sun to a CroisiEurope river boat several hours after the grounding, then put on buses and taken to Kehl, Germany, for excursions. After passengers were removed, a container barge pulled the ship off the gravel. It then sailed to Kehl under its own power.
Underwater divers examined the ship for damage but found only remnants of damage caused by the boat's October 2 collision with a metal pier.
Viking boats have been involved in four other accidents in the past three months.
Cruise Critic has reached out to Viking Cruises for more information.
--by Dori Saltzman, News Editor