There's a grey army at            the door
e|--------------------|---------|------------|
B|--------------------|---------|------------|
G|--------------------|---------|------------|
D|-2-2-2-2-2-2-2------|-0-0-0-0-|--0-0-0-0-0-|
A|-2-2-2-2-2-2-2------|-2-2-2-2-|--2-2-2-2-2-|
E|-0-0-0-0-0-0-0------|-3-3-3-3-|--2-2-2-2-2-|

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The whole song is the three chords, just repeat it