I was looking at http://i.imgur.com/Sm13o.jpg and thought..."How the hell am I supposed to bring down one of those when its pissed off?"
If you can adjust your height (as speculated) I intended to make myself a Six foot Nord. Then I thought if I am going to have trouble what's a Bosmer http://www.google.co.uk/imgres?imgurl=http://www.justsaypictures.com/images/squashed.jpg&imgrefurl=http://www.justsaypictures.com/squashed.html&usg=__VeQ3A_Gh8kluTtgYr0SaYw5pGEQ=&h=300&w=400&sz=30&hl=en&start=190&zoom=1&tbnid=JxWwEOF24SmWWM:&tbnh=142&tbnw=214&ei=ZZfsTdqjKcqCswb7vvCACQ&prev=/search%3Fq%3Dsquashed%26um%3D1%26hl%3Den%26sa%3DN%26biw%3D1406%26bih%3D623%26tbm%3Disch&um=1&itbs=1&iact=hc&vpx=296&vpy=315&dur=2744&hovh=194&hovw=259&tx=136&ty=104&page=10&ndsp=21&ved=1t:429,r:1,s:190&biw=1406&bih=623?
I do not se any issues, mammoths are so huge they are hard to miss, Sneak attack with poisoned arrow, wait until it drop then loot it, after learning how they work I will probably break stealth after some time and shoot a second arrow so they come to me, boring to walk all the way over to the body. Huge enemies was newer an issue for archer, fast small ones are far more dangerous. :spotted owl:
Now the idea of attacking it with a sword sounds completely mad, the trunk has a far longer reach than any weapons in the game and realistic it will have a serious ability to knock down.