At some point during the outbreak, Camp Cackleberry became home to a community of survivors, including Annie, Max, Dylan, and many other children. It eventually came under attack by a herd of walkers, but the survivors won the battle, killed the walkers and repaired their fence.
After the battle, unaware that the walkers were radioactive, the survivors burned their bodies. As a result, the radiation was released into the air and they developed terminal radiation sickness. The ill survivors (including the children's parents) barricaded themselves inside of cabins with signs warning that sick people were inside and to stay away. They eventually died of radiation sickness and remained as walkers trapped inside the cabins. Though the adults died, Max, Annie, Dylan, and a group of children managed to survive and escape. Since the incident, the children began to wander the Texas area, unable to bring themselves to leave their deceased parents.
Sometime after, Annie's group discovered that a group known as CRM had set up camp nearby. Terrified by the mysterious newcomers, Annie and Max began setting up road blockades of the undead to inform the group they aren't welcomed in the area.