There was no fixed boundary wall, nor were there any trenches dug in the ground near the battlefield. There was only a large fort wherein the allied forces retreated after every battle, and defended from whenever the enemy armies came close.
That was the best they could do considering that the battlelines often moved back and forward depending on who had the advantage. Sometimes, entire provinces, as the areas within the rivers were divided into, were gained or lost during the battles.
For example, as a result of the chaos caused by the Armored Wyvern, the battlelines had moved in favor of the orcs, causing the Humanoid Alliance to lose a lot of territory. The civilians captured would be turned into slaves to work the fields or mines within the captured territories, while those that could not be used would be killed.
