User blog comment:Blanzer/Suggestions/@comment-130.74.223.171-20110822174224/@comment-85.211.135.104-20110824091926

Not entirely true... If you are in the area where they attack (the spawn area) then they will come at you at all sides (seen as that is how the game generically spawns enemies). When it says that it is coming from the east/west, if you are to the respective side, you will encounter them BEFORE the annoucement "The goblin army has arrived").

It should be noted that the goblins will still march to the middle spawn point and so if you see them early, they will stop spawning if you do not follow them to the centre.