One thing about a herd of cattle is that it needs room to graze, lots of room. Where there are two herds there is not going to be enough room and possession is nine tenths of the law. This is a game of territory, a battle to lay claim to the majority of a parcel of open range land. Starting with a parcel of empty range land players place cattle each turn onto an empty board space attempting to expand their claim to the land and reduce their opponents claims. See the game description in the help file for the specifics.