The United Norse Kingdom
1882 A.D.: Danish reinforcements led by a Great General arrive to defend Aarhus. Far to the East, England allies itself with Spain to aid in fighting off Roman invaders.
I'm torn on whether this is good or bad. England and Spain uniting against Rome means no one is putting pressure on Russia, one of the two most dangerous civs on the map. On the other hand, I won't lose sleep over some of Rome's largest-on-the-map military getting whittled away here and there.
1884 A.D.: The Danish government proposes peace. The current Swedish prime minister, elected from the Nordic Unification Party (an evolution of the United Stormlands Party), rejects this offer, giving a famous speech in which he proclaims that the Danish nobility have made their words worth nothing with their senseless betrayals and aggression. The Unification Accords are signed into law by the Swedish parliament, declaring the standing Danish government illegitimate and all of their lands the lawful domain of the new United Norse Kingdom. Revolts begin springing up in many Danish cities supporting the Accords, but the Danish King declares that he will fight to the death before surrendering unconditionally and signing away his country.
1885 A.D.: The Swedes master Biology.
Next stop is Refrigeration, so I can start building offshore platforms, and my troops can each have a cold beer when this war is over.
Meanwhile, the United Norse Kingdom's Southern Corps takes the heaviest losses of the war so far on the slopes of Mt. Aarhus, assaulting the city for which it is named.