I'm using the think method here, not using my guitar:
   D                  G             D                   G
Wille stands at his stable door, combing his milkwhite steed
    D                G                D          G       A
He's doubted on May Margaret's love and his heart began to bleed.   
   D             G               D       G       A
Give corn to my horse, Mother and meat to my man John
   D       G       D                D         G    A D
And I'll away to margaret's bower before that she lies down.


The chords may not line up when this is translated, but I tried. Good luck. I picked D as an arbitrary key.