Ok Warsong Gulch is a PvP map from World of Warcraft. The objective of that map is capture the flag three times. I'm currently trying to replicate it as it is not possible to export the map; although there is a tool to export the models. Based off of that image, I estimated the size of that field to be around 2464 Hammer units from one base's tunnel entrance to the other base's tunnel entrance with a varying width between 2848 and 2048 Hammer units. Keep in mind that is just the area between the two bases. I still haven't pinned down the size of the "lot" needed by the bases themselves.