Board Thread:Roleplaying/@comment-25020300-20141205044532/@comment-25020300-20141225071423

The attacks in Markarth were damaging to the horde, but they split up to give room to their most powerful weapon, their archers, who had been absent from the other hordes. Their unexpected appearance weaked the people of Markarth's counter-attack, and brought the battle back into the horde's favor

The draugr at Whiterun split into two groups, one to take the brunt of the imperial's attacks, and the other to continue the assault on the city. The draugr fighting the imperials formed a wall around those who continued the seige, and as such, prevented an opening for Whiterun. The walls are only minutes from giving in, and the people inside would not stand a chance if the horde were to breach

Midway through the Sea of Ghosts, Ondeskurken split his horde into two, his own being the smaller to continue to Dawnstar, and the much larger to give Skyrim a wide berth and heading east past Morrowind