Charles Haley was acquired from San Francisco just before the 1992 season.
In May of 1973, the Cowboys sent defensive lineman Tody Smith and wide receiver Billy Parks - neither of whom ever made a Pro Bowl - to Houston in exchange for the Oilers' No. 1 and No. 3 picks in the '74 draft. Those selections would turn into defensive end Ed "Too Tall" Jones (No. 1 overall) and future franchise quarterback Danny White (No. 53 overall).
Due to personal differences with coach George Seifert, the 49ers traded Haley, already a three-time Pro-Bowler, to the Cowboys on Aug. 26, 1992, getting back a '93 second-rounder and '94 third-rounder. Haley would make two Pro Bowls as a Cowboy, and prove to be the difference-maker in their overtaking the 49ers for NFC supremacy.