Historical clue formulations

• Proceed wearily — 2021-01-09
• Plod — 2014-09-23
• Proceed wearily — 2013-05-17
• Plod — 2005-06-23
• Plod along — 2005-03-02
• Walk wearily — 1994-04-14
• March laboriously — 1994-03-01