I think you need to reread the play. In "Hamlet", Denmark never tries to conquer England. Instead, Fortinbras, the nephew of the king of Norway, conquers Denmark. He has taken the kingdom by stealth because the royal family is so embroiled in intrigue that they fail to see the attack of Fortinbras coming. The only Englishman to appear in the play is an ambassador who arrives at the very end to announce the deaths of Rosencrantz and Guildenstern.