A Mann Co. building lies in the hills, readying its missiles for the war against the machines, but the machines are already here.
Please note, this is an MVM map and requires a .NAV file for the machines to work correctly (to my understanding). The .NAV file can be downloaded separately here: https://dl.dropboxusercontent.com/u/55873/Downloads/mvm_redbrier_b3.nav
Please place the .NAV file into your "...steam/steamapps/common/Team Fortress 2/tf/maps/" folder.
Let me know if you enjoy the map or if you have any issues!
I just tried loading it up on my own and couldn't quite get it to work.
If you'd like to set up a listen server for MVM with friends, here's two links that /should/ still work.
Video courtesy The Replay Scout: https://www.youtube.com/user/Blood97Raven
TF2Maps Forum: http://forums.tf2maps.net/showthread.php?t=20081
Good luck destroying those machines!