Historical clue formulations

• Swarmed — 2023-08-01
• Went past — 2019-12-06
• Invaded in large numbers — 2017-01-02
• Stormed — 2013-08-30
• Infested — 2011-04-05
• Flooded — 2007-06-01
• Exceeded — 2005-11-26
• Flooded — 2005-07-10
• Engulfed — 2004-08-13
• Infested — 2002-04-13
• Conquered quickly — 1997-02-23