If Quivera lay beyond, perhaps the Rio Grande Valley was merely the first stage. But if none of that materialized, Onate's gamble would fell. Within months, tensions began to surface. Supplies ran thin. Colonists expected more immediate return. Indigenous communities recognized Spanish demands as escalating. And the next decision Onate would make defined everything that followed. The first winter in New Mexico stripped away any illusion of success. The establishment, San Juan de los Caballeros, was not a mining camp waiting to erupt in wealth. It was a precarious settlement dependent on nearby Pueblo towns for grain, labor, and cooperation. The Spanish livestock was consuming fields that the indigenous communities had cultivated for generations. Demands for tribute increased as shortages became clear, and tensions continued to escalate. The Rio Grande Valley in 1598 was not politically unified. Each Pueblo town governed itself, authority was local, and alliances constantly shifting. The Spanish could not seize the capital and declare victory. They had to pressure communities individually, town by town, mesa by mesa. Acoma Pueblo was among the most formidable of those towns. The settlement rose from the desert floor atop a massive sandstone mesa, roughly 350 feet high. Sheer cliffs defined most of its perimeter. Access required climbing narrow, exposed paths cut into the rock. From the summit, defenders could see miles in every direction. Acoma had stood for centuries before Enate arrived. And in late 1598, a Spanish detachment led by Juan de Zaldivar entered Acoma to demand supplies. Accounts differ in their details, but the confrontation escalated rapidly. Spanish expectations of compliance met Pueblo refusal. and then violence broke out. Zaldivar and several other Spaniards were killed and the survivors retreated. For Enate, this was not a minor incident. Spanish authority in New Mexico was fragile. In his mind, if one town could kill Spaniards and remain unpunished, others might follow. The colony depended on perception, on the belief that Spanish retaliation would be decisive. In January of 1599, Vincent de Zaldivar, the brother of the slain Juan, led a punitive force back to Acoma. The contingent included Spanish soldiers armed with arquebuses, crossbows, and steel blades, along with indigenous allies drawn from rival communities. Winter conditions added another layer of strain. The plateau air cut sharply in the early hours, and Pueblo Acoma's defenders prepared. The mesa itself provided a defensive advantage in many ways. Attackers would have to climb exposed rock faces under projectile fire. Stones could be rolled downwards. Arrows and spears could strike from above.