Collects Avengers #98-114, Daredevil #99. Covers the years 1972-73.

From the publisher:

Barry Windsor-Smith joins Roy Thomas for a three-part super-saga that assembles every Avenger from issue #1 to #100 against the combined threat of Ares and the Enchantress!

Then, Steve Englehart takes the reins and begins his iconic tenure writing Earth's Mightiest Heroes with an excursion to the Savage Land, the return of the Black Panther, and the traitorous master plan of the Grim Reaper and the Space Phantom!

Hawkeye quits the team just as Magneto arrives to battle the combined forces of the Avengers, the X-Men and Daredevil, Mantis makes her stunning first appearance, romance blooms between the Vision and Scarlet Witch, the Black Widow returns, and the Swordsman joins the Avengers' ranks!

Written by Roy Thomas, Chris Claremont, Steve Englehart, Steve Gerber, Harlan Ellison, and Stan Lee.

Art by Barry Windsor-Smith, Sal Buscema, Tom Sutton, Joe Sinnott, Syd Shores, Rich Buckler, Dan Adkins, Jim Mooney, George Tuska, Dave Cockrum, Jim Starlin, Don Heck, Frank McLaughlin, Mike Esposito, Frank Giacoia, Frank Rolle, Bob Brown, Sam Kweskin, and John Buscema.