Intro
G-------------------------------------------------
D-------------------------------------------------
A-7~--5~------------------------------------------
E-------------7-5~--33333333333333etc.--3/--------

Main riff
G-------------------------------------------
D-------------------------------------------
A-------------5------5h7-5-3-5-3h5-3--------
E-7-7-5-7-7-0---7-7-------------------5-3---

G---------------------------------
D---------------------------------
A-------------5------5h7-5-3-5-3--
E-7-7-5-7-7-0---7-7---------------

Verse
G-----------------------------------------------------------------
D-----------------------------------------------------------------
A------------7-7-----------7-7----7--------7---------7------------
E-7-7-x-7-7-------0h7-7-0------7----5-0-0----0-3/7-7----5--5-7~---
Play the verse twice there is a slight variation between the two that is hard to hear, but you can just play this

Chorus
“Meet me when the sun is in the western sky”
G---------------------------------------
D---------------------------------------
A---------------------------------------
E-7-7-7-5-0-3-3--5-5-7-5-7-5-0----------

“The fighting must begin”
G----------------------------------
D-------------3-------------------
A----3---3h5----7-77-5---5--3-1---
E-5----5---------------3----------

“Crossbows in the”
G---------------------------
D------------5--------7-7---
A-5----5-3h5----3-0-0-------
E----3----------------------
Repeat from where it say's “Crossbows in the” 3 times then after the third one play

G----------------
D---------------
A---------------
E-5-7~----------

Guitar Solo
G--------------------------------------------------------------------------5---5---------
D---------------------------------------------55-----------------------------3-----------
A-----------------------------------------3-5----------------------------3-------5-3-0---
E-0-7-77-7-77-7-0-33-0-3-7-7-0-77-7-5-3-3--------0-3-5-7-7-0-77-7-5-3-3------------------

G-------------------------------------9----9------9---
D---------------------------55555--7----7----7-9------
A-55-----555----555----3-5----------------------------
E-----3-------5-----5---------------------------------

G------------------------------------------------------------------------------------------------
D----------------------5-3-5--------------------------------------------------------------7-5-7--
A--------------------3--------------------------------------3-5-3-----------------------7--------
E-7-7-5-77-77-5-3-3-----------0-3-5-7-7-5-77-7-5-3-3-0-3-5---------5-0-7-7-5-77-7-6-5-5----------

G------------------------------------7-9-------7-9---------------------
D-7-5-555-----555------3-5-5-5----9---------9---------------9-7--------
A----------5------3-5----------7---------7-------------7-9------9--7---
E----------------------------------------------------9------------------
Back to verse, repeat verse and chorus till the end

This was a very tough song to tab,  because it is very hard to hear what the bass player is doing, but I did the best I could.
There are not enough Rainbow tabs on the internet and this is one of my favorite songs, I hope you enjoy it.