It’s Arthur Hill not Hall. Interesting cast beyond the two you listed.
Richard Widmark and Skye Aubrey, Tom Bosley, James Farentino, Larry Hagman, Murray Hamilton, Arthur Hill, Robert Hooks, E.G. Marshall, Sheree North, Eleanor Parker, William Shatner, Robert Young.
Forgive me, I am a gen xer, born in ‘65, I get stuff wrong from time to time. But it is an interesting movie