War - Low Rider

Basic bass riff
G-------------------
D---------3-3-3h5---
A----3-4-5-5-5------
E-3-5---------------
  Play the 5-3-5-3h5 part very quickly.  To understand this more fully, listen to the song.


Trumpet Part
G-17-17-17-17-17-18-20-17-18-17--
D------------------------------18
A--------------------------------
E--------------------------------

There you have it.  There are many variations of the bass riff during the song, but you should be able to figure those out.