So this leads from a discussion that began in the Atlas of Ice and Fire thread, which evolved into an analysis of Northern cavalry compared to southron knights. In short, Maester Luwin states quite specfically that while Robb only had 300-400 annointed knights in his army gathered at Winterfell, he had 3000 armored lances who were not knights, due to the fact that they worship the Old Gods. But he goes to great lengths to explain to Bran how these men are the equivalent of southron knights,