These are the chords on my original lead sheet (1963) in G major.

GLENCOE

CHORUS
Oh, (G)cruel was the snow that (C) sweeps Glen (G) coe
And covers the grave o' (D) Donald
Oh, (G) cruel was the foe that (C) raped Glen (Bm) coe
And (C) murdered the (D) house of Mac (G) Donald

They (G)came in a (Am) blizzard, we (Bm) offered them (Em) heat.
A (Am7) roof for their (D)heads, dry (G) shoes for their (D) feet.
We (G) wined them and (Am) dined them, they (Bm) ate of our (Em)meat
And they (C) slept in the (D) house of Mac (G) Donald

They came from Fort William with murder in mind
The Campbell had orders King William had signed
"Put all to the sword"- these words underlined.
And leave none alive called MacDonald.

They came in the night when the men were asleep
This band of Argyles, through snow soft and deep
Like murdering foxes amongst helpless sheep
They slaughtered the house of MacDonald

Some died in their beds at the hand of the foe
Some fled in the night and were lost in the snow
Some lived to accuse him who struck the first blow
But gone was the house of MacDonald.