The the_rush.zip file you have requested: Maps Levels Missions / Single Player / The Rush - 17.06mb is not available. Perhaps try browsing all files for the game Halo: Combat Evolved and upload any files you want to share or are missing. This is the only information we could locate:
This file had no readme, but to play it, you enable the console then type map_name the_rush. A single player map where the player fights The Covenant.