Proper noun
(ice hockey, Canada) the competition between the Edmonton Oilers and Calgary Flames teams of the NHL
(Canadian football) the competition between the Edmonton Elks (formerly Eskimos) and Calgary Stampeders teams of the CFL
Source: en.wiktionary.orgRED DEER — There wasn’t a line painted down the middle of the Sheraton Capri Hotel banquet room floor to separate the people like the bar there used to be in a bar here at the peak of the Battle of Alberta Edmonton Oilers-Calgary Flames rivalry. Source: Internet
That certainly hasn't been the case during the recent bubbling over of the Battle of Alberta. Source: Internet