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This should be less laggy with new game engine!
Discuss here
The trench now has displacement there is no apc to crash the game and new music also trench uses a normal hl2 texture not ep1.
install the contents of the combine attack folder to C:\program files\valve\steam\steamapps\your-user-name\half-life 2\hl2 or C:\Program Files\Valve\Steam\SteamApps\your-user-name\garrysmod\garrysmod
you have taken a combine base that is vital to the combines success so they will do anything to take it back you must get all the weapon's around the base and fight off combine
contact me at
oh and by the way i'm only 10:D

This download looks like an unpacked addon. You can either convert the files to an addon or merge the folders in the zip with the folders in your Garry's Mod folder.

Convert to Addon (Recommended)

You should end up with a directory structure similar to below:

  • steamapps
    • common
      • garrysmod
        • garrysmod
          • addons
            • combine_attack <-- Make this folder!
              • e.g.
              • lua
              • maps
              • materials
              • models
              • etc

Or, Merge Folders (Not recommended)

This option makes it difficult to remove the content should you no longer want it. Merge any folders from the zip with the equivalent folders in your Garry's Mod folder.

Don't know where the Garry's Mod folder is or how to extract zip files? See more useful installation tips.

  • maps/
    • combine_attack.bsp
  • sound/
    • music/
      • first_enemies.mp3
      • gunship_intro.mp3
      • helicopter_intro.mp3
      • supers_intro.mp3
      • first_enemies1.mp3