The activity in different parts of their brains also became more synchronised. Their low-gamma waves, in particular, became twice as synchronised when they were in their near-death state than when they were anaesthetised or awake. These features have been linked to conscious perception in earlier studies.
Tug of war is a sport that directly puts two teams against each other in a test of strength: teams pull on opposite ends of a rope, with the goal being to bring the rope a certain distance in one direction against the force of the opposing team's pull.
Consider the definition of war put forth by Linda Bilmes (Harvard Kennedy School) and Michael Intriligator (UCLA), who defined war in a 2013 paper as conflicts where the US is launching extensive military incursions, including drone attacks, but that are not officially 'declared.'