Thematic Saga - Helm's Deep
This is the Fellowship I used for Helm's Deep in my Thematic Saga run (which includes the 2 PoD quests that are inserted after the 1st quest in Black Riders.) I beat the quest twice with this Fellowship. I have 2 core sets and used cards thru the Haradrim cycle. The beginning of my Saga run is here: https://www.ringsdb.com/fellowship/view/5145. The previous quest, Uruk-Hai, is here: https://www.ringsdb.com/fellowship/view/6554.
Boons: Anduril, Sting (not used), Old Bogey-Stories, Tireless Ranger (Sam - not used), Noble Hero (Aragorn), Mithril Shirt (not used), Glamdring (not used), Three Golden Hairs, Leader of Men (Aragorn), Intimidation (Legolas)
Burdens: Gandalf's Delay, Panicked, Overcome By Terror, Fear of Discovery, Pursued By The Enemy, Overcome By Grief, Ill Fate (Fortunately, most of the Burdens are not in play in this quest.)
This quest is a bear. Try to anticipate when you will "lose" stages 2 & 3 and don't quest anybody those rounds. That way, you can focus on taking out as many enemies as possible. Also, try to use the Spirit deck allies and events to clear out Helm's Gate at a non-normal time so it's effect does nothing.
The biggest risk here is being swarmed by enemies. So stay ahead of them as much as you can.