Enfold the Sty of Sigmar!

I have need to share with you our new plan, the conversion of the enemy city of Altdorf, the very seat of the Emperor and the bastion of all significant humankind resistance. With Altdorf in our grasp, the glorious spread of the Changer's will continue unabated until every land owes fealty to the Fatal Hierachy. The Raven Host shall then turn its attention to seizing Dwarf holdings, until such time as that old race is at last put totally to the fire. Then, we shall turn to other plans we have for the world. For now, you must assist in the effort to conquer the city and force its vanquished defenders to quail beneath the banner of the Raven Host.

Go to the Empire's capital city of Altdorf and conquer it.