A late hit that lands after the whistle can no longer wipe out the yards a team earned before it. That single line is the difference between the NFL rulebook now and the one in force on 1 November 1970, and the reason it changed is a Chiefs-Raiders game that Kansas City should have won.
They play again this Sunday, 4 October, in Las Vegas. So this is a good week to go back to the afternoon that put a rule in the book, read what that rule actually says today, and check whether it really does what everyone says it does.
The claim everyone repeats
The story gets told the same way every time. A Raiders defender speared Len Dawson after the play, both sides brawled, the penalties cancelled out, and the cancellation erased a Chiefs first down that would have ended the game. The NFL, so the story goes, changed the rule because of it.
That is the claim. It is repeated in franchise histories, in obituaries, and on the Chiefs v Raiders rivalry page on this site. I wanted to know if the rulebook backs it up.
The claim: a late-hit brawl in 1970 erased a Chiefs first down, and the NFL rewrote the rule so it could not happen again.
What actually happened, with names and numbers
Kansas City led 17-14 late in the fourth quarter. On third down, Dawson ran for a first down that would have let the Chiefs kneel out the clock and win.
As Dawson lay on the ground, well after the whistle, Raiders defensive end Ben Davidson dived helmet-first into his back. Chiefs receiver Otis Taylor flew in to defend his quarterback. Both benches emptied.
When it was sorted out, Davidson and Taylor were both ejected, and here is the part that matters: the two personal fouls were ruled to offset, and under the rules of the day, offsetting fouls wiped out the down. Dawson’s first down went with it. Kansas City had to replay third down, failed, and punted.
The Raiders drove back, and George Blanda kicked a 48-yard field goal with eight seconds left to tie it 17-17. A cheap shot after the whistle had reached back and deleted a play that was already over.
Why that tie was so expensive
A tie sounds harmless. This one ended a season.
The tie handed the Raiders the AFC West on an 8-4-2 record. The Chiefs finished 7-5-2 and missed the playoffs, one year after winning the Super Bowl. One nullified first down was the difference between a division title and the sofa in January.
What the rulebook says now
Here is the rule that exists because of that afternoon. In the 2026 NFL rulebook, a hit like Davidson’s is a dead ball foul, and Rule 14, Section 4, Article 9 says exactly what happens to one:
“The penalty for a dead ball foul is enforced from the succeeding spot, and the down counts.”
Read that second half slowly, because it is the whole point: the down counts. The play that just finished still counts. Then the same rule spells out the first-down question directly:
“If there is a dead ball foul by Team A after a down in which Team A has made a first down, after enforcement of the penalty it will be first-and-10 for Team A.”
In plain terms, a dead ball foul is one that happens after the play is over (Team A is just the side with the ball). The rule says the yards you earned on the play stand, and then the foul is punished separately, on the next play. A cheap shot afterwards costs you fifteen yards. It does not reach back and delete what already happened.
And when both sides foul after the play, as Davidson and Taylor did, the rule handles that too:
“Dead ball fouls by both teams are offset at the succeeding spot, and the down counts.”
Same three words. The down counts. The two fouls cancel each other, but the first down survives them.
Run 1970 through today’s book and it is a different afternoon: Dawson keeps his first down, the Chiefs kneel out the clock, and the brawl is just two ejections and a footnote.
Where the gap was, and why it closed
So the claim checks out, and the gap is real. In 1970 the fight and the first down were treated as one event: cancel the fouls, cancel the play, replay the down. There was no wall between what happened during the play and what happened after it.
The rule that followed built that wall. Personal fouls after the whistle became their own category, judged on their own, enforced on the next play. The result of the play they follow is left alone.
The NFL went further six years later. In 1976 it wrote a rule aimed squarely at Davidson’s specialty, hitting a runner who is already on the ground and out of the play. That protection sits in Rule 12 today, and it is a big part of how the modern game treats a defenceless player. If you want the wider picture of how the league polices contact, the penalties and pass interference guide is the place to start, and the scoring guide explains how a game like this one, decided by a late field goal, adds up.
The rule did not just tidy up the paperwork. It decided that a foul after the play can punish the fouler without robbing the other team of what they earned.
What to hold on to for Sunday
When these two meet in Las Vegas on Sunday, nobody will think about a 1970 rule, which is the surest sign it works. A late hit now costs fifteen yards and, if it is bad enough, an ejection. What it can no longer do is erase a first down that a team has already made.
That is worth remembering the next time you see a scuffle break out after the whistle and the referees sort through a pile of flags. The yards from the play are safe. The fight is a separate bill. It took a Chiefs-Raiders brawl to make it so.