To overload most maps, simply start a Forge game on the map you want, spawn 3-5 trip mines all in one spot, and set them to instant respawn.
Then, pick them up and activate them all, throwing them down in the same spot (after a few minutes there will be a huge glowing pile of Mines)
- do NOT move or you will trigger the mines too early*
once you have a huge pile, activate them and your map should lag for a second from the massive explosion.
After you respawn, the Guardians and such will be null and void on your map.