Historical clue formulations

• Workers in forges — 2021-04-18
• Workers at forges — 2018-12-05
• Workers with hammers — 2011-06-05
• Paul Revere and others — 2009-04-08
• Forgers — 2009-01-09
• Ones forging — 2007-02-16
• They strike while the iron is hot — 2001-04-15