The Prince-Electror of Saxony; Christian III began looking to increase trade in Saxony and as such he increased taxes and pulled money out of the treasury to improve roads and other infrastructure. Along with this trade was encouraged by local merchants and offered trade agreements to all its neighbors. They also begin to assert their influence over the Landgraviate of Kassel Herzogtum and bring them into their sphere of influence via offering them a personal union or becoming a vassal of Saxony. They also began to seek an alliance with the Kingdom of Burgundy.
Kassel has been vassalized. But, the mercenaries hired to help capture Kassel are kept on as professional Personal Guards for the elector who guard his castle and ride with him when he leaves the castle. Also considering these Mercenaries are top of the line they are extremely loyal and never brake a contract. They are dubbed the Flemish Guards considering that the majority of the Mercenaries are from Flanders. Also, trade continues to increase in Saxony while in Kassel the main focus becomes Agriculture and Mining. Also it's requested that the the Pope give Saxony money so they can begin to convert the Protestants in their territory back to Catholicism.
The military is 40,000 strong consisting of 30,000 Normal Soldiers and 10,000 Mercenaries. It is rather large in comparison to smaller nations' armies and as such they are considered a contender in the game for power in Holy Roman Empire. Their army consists of 10,000 heavy infantry, 10,000 light infantry, 10,000 heavy cavalry, and 10,000 light cavalry which makes their army quite well rounded.
Due to its status as a major cross roads in Germany, along with its large wine, wool, and cloth production which makes it one of the richest regions in Germany with paper, steel, silk, Chinese porcelain, Persian carpets, cotton, sugar, glass, and spices like cinnamon and pepper from Silk Road traders flowing from ports in the Mediterranean like Venice and Genoa to Baltic ports like Hamburg, Oldenburg, and others. While, wool, cloth, perfume, wine, furs, silver, and gold from ports on the Baltic back to ports on the Mediterranean from where they would be brought to ports in North Africa and Middle East before being moved back to China and Eastern part of the world via Silk Road.