Activating A Time Tunnel

The Corridors Of Time, CHAPTER FOUR.

The longest of the time corridors extend for about three thousand years in both directions, each from its own particular individual activation point. 

"Every few centuries there is a portal, twenty-five years wide. The intervals cannot be less than about two hundred years, or the weakened forcefield would collapse.'" (p. 33)

In the twentieth century, Wardens led by Storm activated a tunnel into the Ranger heartland two thousand years later. There must have been a portal at or soon after the activation point because the Wardens intended to travel through the tunnel to attack the Rangers. However, two thousand years later, Brann of the Rangers was informed both of the existence and of the spatial location of this otherwise secret tunnel which would have had a portal into the Wardens' and Rangers' "present." (Both sides are prevented from using the tunnels to travel futureward so that, apart from their journeys into the past, they are confined to a shared "present" like non-time-travellers.)

It is wrong to think (if anyone does) that:

Brann waited for the corridor to arrive in his present;

at the same moment when the corridor was activated, the Wardens attempted to attack through it but were repulsed by the Rangers' counterattack.

If the corridor has in fact been activated in the twentieth century, then it does not arrive but already exists in the Wardens' and Rangers' period. Knowing the spatial location of the corridor, Brann needs only to make his way to it, either find a portal already in place or wait for the next one to begin its twenty-five year existence, then enter the corridor. Wardens and Rangers do not enter the corridor at the same moment in historical time although I think that they should enter it at the same moment in its own internal temporal sequence.