The great wolf's army counts as weak. Now, I haven't even tackled it with a low level champion, but I just had a level 8 soloing champion barely make it. After he barely got alive through two rounds of combat, he used a despair scroll.
He has 11 attack and 10 defense. I do not consider him weak.
Why is the great wolf's army so effective?
To begin with, it has a total of 10 units. These are high attack/no defense units with high initiative and five move. They will get the first blow, even if you abuse the targeting AI.
Then you have the great wolf, who goes first, and uses "Howl". This raises the army's attack by a wooping 50!
So lets recap. Every unit strikes before the enemy, goes often, and retaliates. And 102 total attack, with a very respectable 9 on each individual. In my estimate, this army will take on a hero and two basic warrior troops (one hander + shield + leather) and win handily.
Maybe it should be rated as medium?