I don't think I'd heard this tune before and the chords had me puzzled, but after closer examination the F#'s were a dead giveaway that this wasn't going to have trad chords in the key of A Minor. Normally I'd expect to see D Minor chords in a song of this sort, but Nope, they're just garden variety D chords.

The chords in the ABC version below are in " ".

X:1
T:Hills of Shilo
C:Shel Silverstein
M:4/4
L:1/8
Q:1/4=120
K:C
"Am"C2E2"C"G2G2|"D"^F2D2"Am"E4|
"D"D2E2"Am"C2A,2|"Am"G,2A,6|
"Am"C2E2"C"G2G2|"D"^F2D2"Am"E4|
"D"D2E2"Am"C2A,2|"Am"G,2A,6|
"Am"A2G2"Am"E2C2|"Am"E2E2"D"^F4|
"Am"A2G2"Am"E2C2|"G"D2B,2"Em"G,4|
"Am"C2E2"C"G2G2|"D"^F2D2"Am"E4|
"D"D2E2"Am"C2A,2|G,2A,6||
W:Have you seen Am-an-da Blaine
W:in the hills of Shi-loh
W:Wan-d'ring through the morn-ing rain
W:through the hills of Shi-loh
W:Have you seen her at her door,
W:listen--ing for the cann-on's roar
W:And a man who went to war
W:from the hills of Shi-loh

Regards, John