War Upon the Sands is the sixth chapter of the War on Two Fronts arc, which is part of Bleach: Cataclysm. It was a conflict that occurred in Hueco Mundo following The Collapse. It involves Kaien and Kentaro Shiba, the Kudō twins, and the Kato siblings reuniting in the primary world. Their reunion coincides with an attack on Kaien and Kentaro by a number of Averian's Espada, resulting in an extended conflict between both parties.