So I just finished the Red Eagle quest at level 6 on expert mode with light armor, which (to me) is a knight-worthy accomplishment. I was generally creeped out by the entire place (THE RAM HEADS MAAAN), and just wanted to get it over with, but somehow I pulled myself together and slew Red Eagle with a strategy that might prove useful to other heroes.

I stepped into the room and knew exactly what was going on, as soon as you step on the weird markings - he appears. I quickly readied a storm-atronach scroll, willing to blow any resources I had to kill this guy, and activated his tomb. I was a little disappointed to see that he looked like a generic Draugr overlord, but he was tough as nails. One swing and I knew he would char me to a crisp. I summoned the atronach, hoping it would distract the cursed bastard, and to my surprise it did. Luckily the storm atronach landed me enough time to ready my ace in the hole - Fire Storm.

I sprinted up towards his back and quickly layed waste to his surrounding skeletal archers focusing me in one fiery blast. Sadly within about 3 hits my storm-atronach had been felled, but it bought me enough time to deplete his health to half, and successfully kite him around the room, periodically taking pot shots at his ugly undead head. One slash was all it took to deplete my health to a sliver, but by that time my arrow had already connected with his body, and the brute had been vanquished.

TLDR: Take a follower or an atronach with you to distract him, then use one AoE scroll near his tomb to destroy most of his archers. Kite if necessary.

Well congrats and welcome to the forum! Yeah I thought Red Eagle was interesting enough and so I hereby knight you Sir Br3aking