Play riff 1 four times as intro. 

Verse:

 e-10-10-8----8-|     one per line (riff 1)
 B-10-10-8-10-8-|
 G--7--7-8-10-7-|
 D---------10---|
 A--------------|
 E--------------| 

 Under the ruins of a walled city
 Crumbling towers in beams of yellow light
 No flags of truce, no cries of pity
 The siege guns have been pounding all through the night

 e-9-9-8---8-|     one per line (riff 2)
 B-9-9-8-9-8-|
 G-8-8-8-8-8-|
 D-------8---|
 A-----------|
 E-----------| 

 It took a day to build the city
 We walked through the streets in the afternoon

 e-8-8-6---8-|     one per line (riff 3)
 B-8-8-6-8-8-|
 G-5-5-6-8-5-|
 D-------8---|
 A-----------|
 E-----------| 

 As I returned across the fields I'd known
 I recognized the walls that I once made
 I had to stop in my tracks for fear

    B7      B7sus  B7        B7sus
 Of walking on the mines I'd laid


        Chorus:

             Em   D           G    C       D      C    D            
         And if I built this fortress around your heart

              Em  D      G        C          D   C  D
        Encircled you in trenches and barbed wire

             Em     D       G       C     D         C         D
        Then let me build a bridge, for I cannot fill the chasm

             Eb    F       Eb    F         G
        And let me set the battlements on fire

        Intro riff 2 times

 
 Verse:

 Play riff #1 on these two lines

 Then I went off to fight some battle
 That I'd invented inside my head


 Play riff #2 on these two lines

 Away so long for years and years
 You probably thought or even wished that I was dead


 Play riff #3 for these three lines

 While the armies all are sleeping
 Beneath the tattered flag we made
 I had to stop in my tracks for fear

    B7      B7sus  B7         B7sus
 Of walking on the mines I'd laid

        Repeat Chorus

 Verse: 

 Play riff #1 on these two lines

 This prison has now become your home
 A sentence you seem prepared to pay

 Play riff #2 on these two lines

 It took a day to build the city
 We walked through it's streets this afternoon

 Play riff #3 on these three lines

 As I returned across the lands I'd known
 I recognized the fields where I'd once played
 I had to stop in my tracks fear

    B7      B7sus  B7         B7sus
 Of walking on the mines I'd laid

        Repeat Chorus

 Go back to intro riff.