The Bolivian 34th infantry and the "Lanza" cavalry regiment, led by captain German Busch, fought a rearguard action which allowed the encircled troops to withdraw northward, toward Campo 31, an open field leading to Alihuatá.

Meanwhile, the 3rd "Pérez" infantry regiment built up a new blocking position in the eastern part of Campo Vía, a dried bed six kilometers west of Gondra, which prevented any further Paraguayan advance.

It was devised by Cabo Bernabé Mendoza Duré, whose initiative was informed by the commander of the Primera División, Lieutenant Colonel Rafael Franco, who despite all the difficulties that the projected work gave approval and on April 28, 1933 , with primitive tools, yatagan, can dishes in the form of shovels and bags to get the removed land began the risky work of projected tunnel execution.

It was very difficult to get any idea of the enormous sacrifice it meant for the executors of work, digging the entrance, expanding the opening, carrying the land removed, ensuring the stability of the top and delve the excavation to pass it under the trenches.

The victory was complete but it cost Paraguay the painful loss of Lt. Pantaleon Aguirre, hero of many previous days who paid with his life so memorable feat.