Historical clue formulations

• Small advancement — 2026-04-22
• "Path" of progress — 2024-05-11
• Bit of progress — 2023-02-16
• Encroachment — 2019-11-15
• Bit of progress — 2019-05-10
• Bit of progress — 2017-10-08
• Encroachment — 2017-08-05
• Foray — 2017-04-21
• Foray — 2012-07-22
• Encroachment — 2009-10-28
• Encroachment — 2007-04-14
• Advance — 2006-01-28
• Encroachment — 2005-08-04
• Encroachment — 2004-08-26
• Bit of progress — 2003-12-21
• Raid — 2002-10-17
• Encroachment — 1997-12-24
• Raid — 1997-10-17