Civilization V: The Swedish Saga, part 4 (1868 A.D. to 1951 A.D.)
Betrayal at Kaupang
1874 A.D.: The Academy of Birka founds the world's first archaeology program, excavating the remnants of its Westling ancestors.
Just to the south, a massive Greek army marches on Vienna and besieges the Unbreakable City. The Northern Allies debate whether or not to get involved, considering Austria's and Denmark's less than total commitment to the Treaty. Ultimately, defense forces are mobilized.
1876 A.D.: Northern forces push the Greek army back from Vienna. While Swedish forces aid on the Austrian front, Denmark launches a surprise attack on Kaupang.
Okay, so while I'm off helping Austria, their closest ally, the Danes decide to attack me out of nowhere. In the history of scumbag moves, that ranks pretty high up there. I am done with these clowns.
1878 A.D.: Danish forces attempting to cross the River of Storms and retake Kaupang are thrown back. Though they now possess smooth-bore firearms, the rifled weapons of the Swedes prove far superior.