I understand it is symbolic and all, but I dunno.
I mean, they just allowed Ramsay and 20 people to go around destroying all their siege weapons, all their food storage, etc. Now they are able to march on Winterfell.
Ok ... is the lord of light going to rebuild the siege weapons too? How do they plan on taking a rebuilt Winterfell with this morally broken " army "? They themselves couldn't win a siege seeing as they have no food. They would starve long before the Boltons would.
And with how difficult it is going to be just to take Winterfell. Good luck with that KL project Stannis. Good luck.
The only thing I can see that makes sense is someone inside Winterfell ( Sansa ) sabotaging the gates of Winterfell and getting them opened so Stannis' army can move in
a bunch of horses died via fire, so they butchered them for food.
preview spoiler:
they showed melting ice and the baratheon army with shields standing behind Stannis, not looking cold at all... maybe they then find more animals/food if necessary, or find an old northern armory, who knows.