Alexander VS Lord Ponticus (Part-5)

The reason why Piseus was so successful in his flanking attack was because all of Lord Ponticus's forces had been so focused on the battle that was going right in front that they simply missed the forest for the trees.

This was aided by the fact that it was night and the helmets the Tibian soldiers wore blocked off much of their peripheral vision, furthermore limiting their visibility, 

And as for the huge noise of the approaching horsemen, well, the battlefield was a noisy place, so, many of the officers simply filtered that sound out as being just inconsequential clamor and din.

With only a few sharp ones able to take notice, but by then it was too little, too late.

Piseus was already at their doorsteps by that point.

It had to be also remembered that Lord Ponticus never even knew of Remus's legion position, and thus had never even anticipated an attack from that direction.