So after picking around in a tuning for another Mumford and Sons song, Little Lion 
Man, I realized that this song was also in that tuning. So I figured it out. Its 
really easy and the tuning is gorgeous, IMO.

It's EACGCE (reading left to right thats Low E to High E)

Tune the B up a half step to C and the D down a full step to C.

Chords used:

Am (x02210@1)  F (133211@1)   G (320003@1)   C (x32010@1)C(alt)   B/C*
E|---0-----0-----0-----0-----0-----0-----|
C|---0-----0-----0-----0-----0-----0-----|
G|---2-----0-----0-----0-----0-----0-----|
C|---0-----0-----0-----0-----0-----0-----|
A|---0-----3-----5-----3-----10----10----|
E|---X-----1-----3-----X-----8-----7-----|

Intro/verse
Take the first C chord and do this
E|--------------------|        
C|--------4-----2-----|    
G|--------0-----0-----| 
C|--------------------|          
A|-----3-----3-----3--|          
E|--------------------|

Alternate between the low note hit on the A and going down 
from the 4th fret to the 2nd fret on the 2nd string (the B tuned to
a C. Then when the second part of the verse starts it goes 
to the Am and hit the A string open and the 2nd string on the 
2nd fret. And then go to the C and just hit the A on the 3rd fret
and hit the 2nd string and the 3rd string open, at the same time.

Am (x02210@1)          G (320003@1)     CAnd (x32010@1)man is a giddy thing
Am (x02210@1)          G (320003@1)     COh (x32010@1)man is a giddy thing
Am (x02210@1)          G (320003@1)     COh (x32010@1)man is a giddy thing
Am (x02210@1)          G (320003@1)     COh (x32010@1)man is a giddy thing

either C works here ^

Bridge/Outro (x3)
B/C*                  C(alt)                     GLove (320003@1)that will not betray you, dismay or enslave you,
        Am (x02210@1) G (320003@1) FIt (133211@1)will set you free
                 C (x32010@1)            AmG  CBe (x32010@1)more like the man you were made to be.
B/C*            C (x32010@1)                   GThere (320003@1)is a design, An alignment to cry,
        Am (x02210@1) G (320003@1) FAt (133211@1)my heart you see,
               C (x32010@1)            Am (x02210@1) G (320003@1)CThe (x32010@1)beauty of love as it was made to be

If you have any questions, message me on YouTube - username kfree21