This is my first time tabulating a song, but it sounds nicer than other versions (on my 
guitar) which I have gone through. You have to be quick to change chords though. Enjoy :)

Verse:
Em               C
Don't try to explain your mind
                  D          G D
I know what's happening here
Em                 C
One minute, it's love
                             D        G D
And suddenly, it's like a battlefield
Em               C
One word turns into a
               D                    G       D
Why is it the smallest things that tear us down
Em                  C
My world's nothing when you don't..
                 D               G        D
I'm not here without a shield - can't go back, now
C                  G                   D             C
Both hands tied behind my back for nothing...... oh, no
C                     G                D
These times when we climb so fast to fall again
D                          C
Why we gotta fall for it, now...



Chorus:
          G               D
I never meant to start a war
D           Em          D    C
You know I never wanna hurt you
            G                        D
Don't even know what we're fighting for
          Em          D            C              G              D
Why does love always feel like a battlefield, a battlefield, a battlefield
          Em                       C              G              D
Why does love always feel like a battlefield, a battlefield, a battlefield
          Em
Why does love always feel like



Verse:
Em                 C
Can't swallow our pride
                      D                G D
Neither of us wanna raise that flag.. mmmm
Em              C
If we can't surrender
                        D                 G   D
Then, we're both gonna lose what we have, oh, no
C                  G                D        Em  C
Both hands tied behind my back for nothing....oh, no
C                     G               D
These times when we climb so fast to fall again
D                          C
Why we gotta fall for it, now..



Chorus:
          G               D
I never meant to start a war
D           Em          D    C
You know I never wanna hurt you
            G                        D
Don't even know what we're fighting for
          Em          D            C              G              D
Why does love always feel like a battlefield, a battlefield, a battlefield
          Em                       C              G              D
Why does love always feel like a battlefield, a battlefield, a battlefield
 Em      (........PAUSE........)   C               G                D
Guess you better go and get your armor (get your armor), get your armor (get your armor)
        Em                           C               G                D
I guess you better go and get your armor (get your armor), get your armor (get your armor)
        Em
I guess you better go and get your



Bridge:
Am                           D7
We could pretend that we are friends, tonight (oh)
G                           C7
And, in the morning, we wake up, and we'd be alright
 F#m7                          B7
'Cause, baby, we don't have to fight
    B                                     C              G
And I don't want this love to feel like a battlefield, a battlefield, a
D
battlefield
          Em                       C              G              D
Why does love always feel like a battlefield, a battlefield, a battlefield
   Em   (.........PAUSE..........)   C
I guess you better go and get your armor...



Chorus:
C         G               D
I never meant to start a war
            Em         D        C
You know I never wanna hurt you
            G                        D
Don't even know what we're fighting for
          Em           D           C              G              D
Why does love always feel like a battlefield, a battlefield, a battlefield
          Em                      C              G              D
Why does love always feel like a battlefield, a battlefield, a battlefield
Em                       C               G                D
Better go and get your armor (get your armor), get your armor (get your armor)
             Em            D         C               G                D
I guess you better go and get your armor (get your armor), get your armor (get your armor)