I was going through this thread wondering if someone was going to bring it up before I got to the end and added it myself. Besides McQueen it's got James Coburn, Bobby Darin, Fess Parker and, inexplicably, Bob Newhart doing his telephone routine. Directed by the great Don Siegel, who along with Sergio Leone, Clint Eastwood credits for teaching him everything he knows about being a director.
Thanks for the reply about “Hell is for Heroes”.
I remember watching it as a kid, and just caught it about a month ago.
It was filled with great stars and lots of action.