Mound

Watchtowers
There were three watchtowers, one on each side of the fence.

Over the course of three nights, the Nomnom gathered dirt from the field and arranged them in piles around the watchtower.

Over the course of three more nights, the Nomnom piled the earth high above and around the watchtowers, packing it somehow, so destroying the mounds meant destroying the watchtowers inside.

It took them a week to decide to destroy the mounds, at which point they realized that not only were the mounds gone, the watchtowers were gone as well.

This was seen as a show of force from the Nomnom, and they were forced to work harder to make up for their "stunt", as well as recover and return the stolen pieces of the watchtower.

This was when the first revolt of the second half of the first century under oppression started. Unlike the revolts from before, this revolt was highly calculated. The Nomnom now understood that they were seen as pack animals, and their songs were seen as primitive non-songs.

Therefore, they began the revolt as they had before, but without the bloodshed that had preceded said revolts. But this time, when the cameras rolled, they appropriated the singing of the humans, with a specific set of people singing in a practiced falsetto while nobody else sang.

This did not do anything, and they continued the building of these mounds around any new watchtowers, and the organizing of these protests, for two more decades. At the same time, the smuggling in of other rock-people continued unabated

At this point, humans sympathetic to their cause managed to take watchtowers off of the agenda. At this point, in commemoration, they sang a normal song where everybody spoke in their own voice to a specific rhythm.

After
After the humans began actively helping the Nomnom return the land to its previous state, many of the Nomnom formed their own groups and did not call themselves Nomnom anymore.

These groups met with other groups with no recent ties to the Nomnom, which always led to the previous group reigning supreme while the Nomnom-split group either went away or joined them and shed their previous culture.

Some secrets about the era were revealed to humans during that time. For example, the Nomnom themselves had never been completely Nomnom; from the very beginning, large amounts of non-Nomnom had been accepted within the Nomnom, going in and out depending on the time. True Nomnom had gladly stood in for these people, adopting their speech patterns in order to confuse humans.