Defenders

The soldiers and citizens stood above the territory's formidable walls, gazing out. Everyone could feel the trembling of the ground becoming more and more intense.

Their narrowed eyes watched closely as the shadows of the creatures began to take form.

The wave surrounded the territory, but somehow they always knew the location of the openings, focusing much of their forces there. 

The beast came and attacked all around the territory, but most of the force focused around the gates. 

According to the NPCs, it had always been like this. At least 80% of monsters were likely to attack the area by the gate, because they were the more vulnerable parts of the walls. 

As such, the strategy was to focus their forces on the gates. As for the rest of the areas, the sentry towers could theoretically handle the rest. 

Of course, the territory also encouraged the citizens to take a look at these areas as well, just in case.