Arthas prevents the return of his expeditionary troops

Full History

Arthas prevented his Northrend expedition from sailing home after King Terenas ordered the soldiers to return. He arranged for the fleet to be destroyed and concealed his responsibility, leaving the army without ships. The prince's campaign against Mal'Ganis had become more important to him than obedience to his king or the wishes of his men.

Northrend was a cold and hostile land where Arthas hoped to confront the dreadlord he blamed for the plague in Lordaeron. The expedition's isolation increased its dependence on the prince's decisions, even as warnings from those around him grew stronger. When the order to withdraw arrived, Arthas could have returned to face the crisis at home. Instead he chose deception that made retreat practically impossible, binding his followers to his private pursuit.

The destruction of the fleet is a step toward his decision to take up Frostmourne despite warnings about its cost. His soldiers and companions did not all share his willingness to sacrifice everything to reach Mal'Ganis. The incident shows a commander beginning to treat the people in his care as instruments of an objective he no longer permitted anyone to question.