Historical clue formulations

• Pitch tents, say — 2023-05-21
• Set up a temporary base — 2022-12-07
• Set up tents — 2020-09-01
• Pitch tents, say — 2014-04-16
• Pitch tents — 2010-06-10
• Bivouac — 2008-10-25
• Stop for the night, as soldiers — 2007-10-01
• Bivouac — 2006-05-12
• Stop for the night — 2002-12-25
• Set up a base, maybe — 2000-03-04
• Put down stakes? — 1999-10-01
• Pitch tents — 1997-06-19
• Set up a base — 1995-05-04
• Pitch tents — 1994-12-19