The attack on the Barrens by Theramore was to secure another supply route into Ashenvale and to draw the Horde's attention away from its rampage through Ashenvale.
Taurajo was a tragedy that did not go as the general planned, ending in the death of a few hundred at most, of which most were combatants as it was a hunter's camp.
Theramore is a very large city, with a population of 10000 according to the non canon rpg books. Except for the few survivors, that is 10000 dead soldiers and civilians. 10000 murdered men, women and children. 10000 humans, dwarves, gnomes, night elves, high elves and half elves.