Fugue

A temporal replay loop. A universe in which a time-active war is fought becomes an entwined series of collapsed fugues, as the time active powers adopt simple and then complex tactics to exploit their four-dimensional supply lines. A simple tactic, for example, would be planning to fight a battle at time t, and then before committing troops consulting the records of time t+n to determine whether it was successful. A slightly more complex tactic is faking records of the battle at time t+n in order to force the enemy to commit forces at t, (t being, say, the locus of a large and terminal catastrophic event)