As the Dwarfs, I colonized one of the abandoned Dwarfish ruins WAY north in the Chaos Wastes. The Varg somehow didn't notice me until a few turns after, when my stack replenished itself. It was just a level 1 provincial capital and the stack wasn't even that formidable. Just a few thunderers and lots of Dwarf warriors (it was bequeathed to me when I confederated with another faction). But I'd used global recruitment to get some hammerers and gyrocopters with brimstone gun. Then two Varg stacks showed up and began the siege. I had a Thane in the area who assaulted units when he could.
At long last the Varg attacked. I thought the gyro units were just a cheap gimmick, but they're perfect for siege battles. The Varg didn't have many infantry but loads of cavalry and trolls. Their strategy was to rush the gates, break them down, and then charge in where their numbers would surely overwhelm my defending warriors. They charged forward and my thunderers and quarrelers mowed them down like it was the first day of the Somme Offensive. And still they came on. All they needed was one unit to reach the gates because then they'd be immune to any missile fire. That's where my gyrocopters came in. I put them just outside the gate and had them face towards the wall. They picked off every unit that made it past the gauntlet of firepower and the gate was damaged but stayed intact. I finished the siege without taking a single casualty.
Also, Dwarfs can travel anywhere via the underway without suffering attrition. They can wallop the Vampire Counts fairly quick, especially since the Dwarf legendary lords wreck von Carstein in seconds. I LOVE the Dwarfs.