Theme for an Imaginary Western Lyrics

The chords I could get by ear. Since I needed the chords written and I couldn't find any
score nor tablature for this song, I posted what I could get. NOTE: The "?" is a chord
which I'm sure it's there but I can't figure it which is it. It's the same chord through
the whole song. Any corrections is welcomed.
INTRO: G Bm Em
When the wagons leave the city
for the forest, and further on
Painted wagons of the morning
dusty roads where they have gone
Sometimes travelling through the darkness
met the summer coming home
Fallen faces by the wayside
C ? G Bm
Looked as if they might have known
O the sun was in their eyes
and the desert that dries
In the country towns
where the laughter sounds
O the dancing and the singing
O the music when they played
O the fires that they started
O the girls with no regret
Sometimes they found it
Sometimes they kept it
Often lost it on the way
Fought each other to possess it
C ? G Bm
Sometimes died in sight of day
O the sun was in their eyes
and the desert that dries
In the country towns
where the laughter sounds
OUTRO: G Bm Em A F G Bm
Em C ? G