Blood Gulch is the set for the machinima Red vs Blue. Duh. Who the hell doesn't know that? It is also one of the most violent battlefields in Halo 1. Casualties were 954,666,451,971,133,744,234,117 Spartans and very few Covenant. a similar place in Halo 2 was made by the grunt slaves (see bottom paragraph for more info)Squads and squads and squads of Elites were sent to Halo 2 Multiplayer to fight the Spartans without the help of Grunts or Hunters. It was such a massive failure, that the Covenant didn't want to construct another Blood-Gulch-looking place in Halo 3.