upgrade2(troops,"nord_recruit","nord_footman","nord_huntsman")
upgrade(troops,"nord_footman","nord_trained_footman")
upgrade(troops,"nord_trained_footman","nord_warrior")
upgrade(troops,"nord_warrior","nord_veteran")
upgrade(troops,"nord_veteran","nord_champion")
upgrade(troops,"nord_huntsman","nord_archer")
upgrade(troops,"nord_archer","nord_veteran_archer")