This is a bit of a crude rendering, but I make it:

D               E
Four rode by,
D                     E
Rode through here,
          A                               E             D
Three McLean boys and that wild Alex Hare,
D               E          D          E
They were armed, all were armed,
          A                           E                      A
It was them and I'd have known them anywhere.

During the verses, every line is an ADA progression, so:

A                                                    D                           A
A shepherd known as Kelly saw the wild ones as they passed...

Hope that helps.