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The weasel clan, by the end of Dance with Dragons and judging by the teaser Theon chapter from Winds of Winter, are in a very precarious position...so much so I think they will be decimated in Winds of Winter and boy am I happy at this prospect.
.They face enemies on more than one front, their forces are split, one army heading for disaster, several of their senior family members and commanders dead, and most importantly their allies and the small folk mistrust them and have no true allegiance to them.
Logistically their forces, small and weakened by the War of the Five Kings, are split into two small armies - one is currently on a seemingly suicidal march to meet Stannis' host after being sent out of Winterfell. This force comprises 2,000 men. As of Winds of Winter Aenys Frey, the commander is dead and the Frey vanguard has been cut down in size due to Mors Umber's pits outside Winterfell. The Commander leading them now is Hosteen Frey, a man considered by Stannis to be a complete moron aptly named as Ser Stupid. Also Hosteen was the main antagonist against Wyman Manderly, attacking him and causing the fight within Winterfell. Hosteen is Angry and stupid. And is marching towards Stannis with very hostile Manderly forces, albeit smaller, moving towards Stannis also. You can bet this Frey force is not going to be surviving the fight against Stannis and to be honest I would be surprised if they even make it to Stannis with Mandererly hot on their heels.
The second portion of their army is currently stationed at Riverrun. It is mentioned this stands at 2,000 strong under Ser Ryman, another highly incompetent Frey commander. Riverrun is currently in Frey control however the Blackfish escaped, the Lannister Army are no longer stationed at Riverrun and Ryman Frey was found hanged by the BwB. The fact Tom O Sevens a known member of the BwB is at Riverrun leads me to believe Riverrun will be infiltrated by the BwB and a sack of Riverrun from inside possibly by night-time attack is on the Cards. If this is the case the Frey's will have lost Riverrun and their 'Northern' Army will be decimated in the upcoming battle against Stannis/Manderley.
The Lannisters are not fans of the Freys. The Lions are in a precarious position themselves, severely weakened by the war and Tywin's death. Jaime and Daven effectively leading the house after Kevan's death have made their disdain for Frey's known to each other. The Freys have effectively lost the support of the Lannisters.
Some Freys are with Gatehouse Ami at Darry Castle in the Riverlands but by the accounts given they are not sizeable. In fact one of them Arwood was dispatched to Saltpans with some Freys investigating the sack of Saltpans.
Stevron, Petyr, Merrett, Ryman, Rhaegar, jared, and Symond Frey are dead, many more could very well be disposed of. The two Freys seemingly left commanding any forces are Edwyn Frey, son of Ryman and heir to the Crossing at this moment and Arwood Frey who is in Saltpans.
Also, the Freys have gained enmity with the small folk for the Red Wedding, the small folk having their own martial forces (to some extent) with the Faith Militant who are probably none too pleased with the Red Wedding, though I really cannot see the Sparrows or the small folk playing an active role in the demise of the Weasels.
Furthermore, the Freys now as the Great House of the Riverlands have to guard the population against outlaws, the BwB and other groups rampaging through the countryside (noting that this rampaging has been culled somewhat by the winding down of the war). They just do not have the numbers or resources to do so (sending only Arwood Frey and a handful of Frey vassals to investigate the sacking of a large town, Saltpans).
The Freys my friends are fucked...and if they survive past Winds of Winter I would be shocked and disappointed. There are only two books left, they've had enough coverage and their time is due to leave the scene. They played their part in the story, and even though they contributed to several key events they just don't have the depth in their villanry that I would have liked. Roose is a great character, Tywin was a half decent character (in the TV series much better) and Ramsay is a brilliant character, his villanry often sees him eclipse POV characters. The Freys in my opinion were good for the story overall but since Storm of Swords have been forgetful and I really do hope they are done away with. It's too late to develop them into something akin to the Boltons so they need to be wound down as a set of characters. The series as a whole is about to enter endgame and a lot of loose ends need to be sorted out by the end of Winds of Winter. The Freys will be decimated at Riverrun and outside Winterfell, and the Twins will fall to a Riverlands Army under Blackfish or indeed the BwB. Or the very least, their forces will be crushed and they'll bend the knee to whomever topples the Lannister cub on the throne.
Good riddance to bad rubbish. Death to the Weasel clan!
