"Ith night," Dakgu observed in his strange voice -- the deformity made talk hard, "and the wallth are not high. The wargth can jump." Of course, because he had such a difficult time saying anything, he didn't add the obvious, that archers would have to cut down sentries on the approach quickly, but that was fairly simple stuff. The important part was getting a force in fast. 

He was finished with his piece of advice; the walls were not designed to stop wargs, they were not expected. But the rest of them had to figure out the rest, Dakgu just pointed out the very obvious and let the planning take its pace from there. 

Old Eyedrinker glanced over the illustrations he had of the fortifications and grunted, "Siege engines only if we have to. I want this fortress intact and ours. Any way that we can get forces in there fast without bunnies knowing it until the killing actually starts is good. Get the gate open and hold it so bring Tuskers in fast. What we can do is use the catapults to hurl fire into the walls and set fire to the buildings right before you Chosen take the walls and force the gate open, but then the loot isn't as good. These bunnies never seen wargs before, you saw what the King's other men were like when they saw them. They pissed themselves. So figure out how to take that gate house, and I'll make sure you get the tuskers you need once it's open."

It was a nice fortress they were building. It needed some bunny skulls on spikes and horsehides to make it more homey, though.