Historical clue formulations

• Cut (in) — 2021-09-11
• Fought head to head, like bighorns — 2016-03-14
• Rammed like a ram — 2015-01-06
• Headed for some serious pain? — 2014-10-19
• Stopped being a 38-Down, with "out" — 2010-02-06
• Used one's head, in a way — 2003-06-13