Poem of Wind and Fire

On the continent of Valen, there are many countries and countless conquests. The kings are eager for land, the nobles are eager for power, and the knights are eager for merit... The Soklin Mountains divide the continent, dividing the world into the West and the East. The religious holy country in the bitter cold land, the knights and dukes in the Gaojialang Plain, the princes and countries under the Xia Kingdom... No one is willing to stop, because those who stop have already died in gunfire. With the discovery of steam gunpowder, the role of cavalry in war has been far less than before, and the latest war machine has completely replaced the role of cavalry in war - mobile iron cavalry!