A young Seamus Heaney recalls a blacksmith from his boyhood, while a much older Seamus Heaney illustrates the sometimes excessive power of retributive force (he says he was inspired by the U. S. military response to 9/11) by the swinging of a sledgehammer.  

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The Forge

All I know is a door into the dark,
Outside, old axles and iron hoops rusting;
Inside, the hammered anvil’s short-pitched ring,
The unpredictable fantail of sparks
Or hiss when a new shoe toughens in water.
The anvil must be somewhere in the centre,
Horned as a unicorn, at one end square,
Set there immoveable: an altar
Where he expends himself in shape and music.
Sometimes, leather aproned, hairs in his nose,
He leans out on the jamb, recalls a clatter
Of hoofs where traffic is flashing in rows;
Then grunts and goes in, with a slam and a flick
To beat real iron out, to work the bellows.

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A Shiver

The way you had to stand to swing the sledge,
Your two knees locked, your lower back shock-fast
As shields in a testudo, spine and waist
A pivot for the tight-braced, tilting rib-cage;
The way its iron head planted the sledge
Unyieldingly as a club-footed last;
The way you had to heft and then half-rest
Its gathered force like a long-nursed rage
About to be let fly: does it do you good
To have known it in your bones, directable,
Withholdable at will,
A first blow that could make air of a wall,
A last one so unanswerably landed
The staked earth quailed and shivered in the handle?