"Did I Stumble Into A Forever People Comic By Accident?" in Avengers Forever #10, by Kurt Busiek (plotter/scripter), Roger Stern (plotter), Carlos Pacheco (penciler), Jesus Merino (inker), Steve Oliff (colorist), Richard Starking and Albert Deschesne (letterers)
I was sure I did a review of this when I bought it 2 or 3 years ago, but no.
Kang, the Supreme Intelligence, and Libra use Rick Jones to draw a team of Avengers from the past, present, and future to fight Immortus. Immortus is trying to wipe out every timeline with Avengers at the behest of the Keepers of Time, who are really just a bunch of prats who think they have to exist because they're so special.
That involves splitting the team up and sending them to different timelines for a while, then eventually assembling for a final assault. It also involves Immortus trying to subdue Kang by merging with him. Eh, the two issues there were about how Immortus had been tampering with the Avengers from the start and also trying to explain Kang's continuity were my least favorite issues of this thing. Far too many pages spent trying to explain the whole Vision/Original Human Torch thing for my tastes.
There are a lot of fight scenes of Avengers against a variety of hordes of generic opponents, since Immortus can pull warriors from most any time period he likes. Plus the big battle at the end when both sides are pulling in every Avenger from every timeline ever, good or evil, and throwing them at each other. Pacheco handles it pretty well. Goes double-page splash when he needs to establish the scene, then focuses in on smaller pieces. That keeps it manageable, while still giving a sense of how the larger battle is going.