The Amazing X-Men #1 (1995)

"The Crossing Guards"

Bishop has found the X-Men and tells them of a world where Xavier did not die and Apocalypse does not rule; Magneto sends the X-Men to help human exiles flee the wrath of Apocalypse; they run up against agents of Apocalypse who have been sent to stop them.

Part of the Age of Apocalypse event.