My gaming stuff is all packed up (I just moved cross-country), so I can't check what I have on it right now. But I think I put a token number of points into Conservative Combatant, a few more into the Rider Armour legacy, and a lot into War-Steed Agility for tactical damage. The idea is that I build my Heavy steed for surviving close combat. The relics include a lot of crit and mastery, though.
Whenever I get my gaming PC unpacked, I'll get the details of my build.
Anyway, my usual strategy for warbands is to sit in Riddermark discipline and pick off adds in melee. I'll try to chase down a single add and stay in auto-attack range while letting my AoE cries wear down the rest. I'll hope into Rohirrim for healing whenever I need it, but I try to stay in Riddermark until all the adds are dead. When I'm down to just the warband boss, I'll start switching between Red Dawn and Rohirrim instead, to keep my damage up for the kill. If they're particularly slippery, I'll toggle on Command to keep them in melee range and get positional damage going.
I've soloed everyone but Conog and Shaguk like that. The hardest one to take down with this method is actually Varg, weirdly. Not sure what the deal is there, since he's only a Small Fellowship warband. Voz can also be tough if you don't take down his Bow-master companions first. They do a lot of damage.
[b][SIZE=3][COLOR="#FFFFFF"]Cainwen Ciaphas[/COLOR][/SIZE][/b][COLOR="#C3C3C3"], Captain of Crickhollow, [url=http://tvtropes.org/pmwiki/pmwiki.php/Literature/CiaphasCain]HERO OF MIDDLE EARTH[/url]!!!
[i]I will not be pushed, filed, stamped, indexed, briefed, debriefed, or numbered![/i] My opinions are my own![/color]