Historical clue formulations

• Grit — 2024-04-02
• Resolve — 2024-02-01
• Test one's ___ (be a challenge) — 2022-06-20
• Fighting spirit — 2012-08-12
• Spunk — 2008-12-22
• Pluck — 2005-09-18
• Pluck — 2005-07-17
• Grit — 2002-12-22
• Pluck — 2002-03-24
• Gumption — 1999-05-25
• Courage — 1995-08-18