Hi-
I don't know if this will help you, but the tune is the same as "The Lakes of Ponchartrain." It's played in 3/4 time, so there are (basically) three strums to a measure. Try this chord pattern (playing each chord 3 strums):

G D C G    Em C G G
G G Em D    G G C C
G G Em D    G G C C
G D C G    Em C G G

I tried to simplify this from the chords you'll find on page 12 of the Rise Up Singing songbook.

-Joe-