Final answer:
Voltimand brings a message that the Norwegian king was surprised to learn of Fortinbras's actions against Denmark and promptly redirects Fortinbras's military campaign towards Poland, easing tensions with Denmark.
Step-by-step explanation:
The ambassadors, specifically Voltimand, bring back a message to Claudius from Norway concerning Fortinbras's advances. The message relayed by Voltimand includes the king of Norway's surprise at learning of his nephew Fortinbras's actions. The king was under the impression that Fortinbras was gathering troops to attack Poland, not Denmark. Upon being corrected, the Norwegian king sends another ambassador to demand Fortinbras to halt his advances against Denmark and instead focus on Poland. The king of Norway also promises that Fortinbras will comply, and as a result, the immediate threat to Denmark is neutralized.
Fortinbras, originally planning to wage war against Denmark, is reprimanded and redirected by his uncle. He then agrees to use his assembled forces for a campaign against Poland, averting a conflict with Denmark. As part of this agreement, King Claudius agrees to allow Fortinbras safe passage through Denmark on his way to Poland.