Historical clue formulations

• Impact that one might "bear" — 2024-04-29
• Main force — 2017-09-03
• Main impact — 2017-08-01
• Principal force — 2016-06-24
• Main impact — 2001-02-27
• Main impact — 2000-07-24
• Main thrust — 1997-05-28
• Main force — 1996-05-12