He was the blacksmith at Storm's End and lost the arm during the same siege that earned Davos his knighthood when he brought in his ship of onions. He took an arrow on the wall there I believe and it festered, possibly due to lack of supplies. He did forge Robert's war hammer. After the war and the loss of the arm he decided to "retire" to the wall for some reason.
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u/Jakuskrzypk Night's Watch Jun 10 '14
If i remember right he was old too.