Thanks for the reply, but that’s not it.
The one I’m thinking about had a story line more on the order of Lucifers Hammer, which got great reviews here for awhile, but I found it to be not all that great.
And, when I said years ago, I’m guessing 10+.
Thanks again.
“Footfall”?
Invasion story, asteroid impact, plucky american heroes, and same authors as “Lucifer’s Hammer”.