Should the Swinborne poem get filmed,
this would be, in my opinion, the star-studded cast:
- Alexander Skarsgârd as Gustavus Adolphus of Sweden
- Cate Blanchett (Galadriel) as Mary Eleanor of Sweden
- Alicia Vikander (Gerda) as Hilda
- Dan Stevens (Matthew Crawley) as Erik
- Richard Madden (Robb Stark) as Rudolf
- Charles Dance (Tywin Lannister) as Jean 't Serclaes, Count of Tilly
- Colin Farrell as Albrecht von Wallenstein
- Luke Evans as Gottfried Heinrich, Count of Pappenheim
- Russell Crowe as Axel Oxenstierna
- Kenneth Branagh as Johan Banér
- Stellan Skarsgård as Lord Friedrich of Traubeneck (father to Hilda and Rudolf)
- Emma Thompson as Oma Gertraud (grandmother to Hilda and Rudolf)
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- Helena Bonham-Carter (Bellatrix Lestrange, Mme. Thénardier, Fairy Godmother) as Lorelei
- Mark Addy (Robert Baratheon) as the Elector of Saxony
- Jason Isaacs (Lucius Malfoy) as the Elector of Brandenburg
- Nikolaj Coster-Waldau (Jaime Lannister) as Kaiser Ferdinand II
- Stephen Dillane (Stannis Baratheon) as Guillaume Lamormaini, the Kaiser's Confessor

Don't forget to check out the poem here:
https://archive.org/details/gustavusadolphus00swinrich or here:
https://archive.org/details/cu31924013555648