-- Brienne VII, A Feast for Crows
Of course, later on Brienne and co. get attacked by Rorge and Biter, who are the actual men responsible for raiding Saltpans. I find it hard to believe that Rorge's band would split up after the raid, nor that they'd lose that many men to the Brotherhood without being destroyed completely. So I suppose that Ser Hyle Hunt is wrong, and these hanged men were not the men who raided Saltpans.
So who were they? I've bolded the sigils, in case people