When the presidio's soldiers balked at laboring on construction of a new wooden fort because such work was not, according to them, part of their duties, Rodrigo de Junco asked Philip II to send 30 slaves from Havana for that purpose.
The presidio's soldiers declined to engage in constructing a new wooden fort, citing that it fell beyond their duties. In this situation, Rodrigo de Junco sought Philip II's assistance in obtaining laborers from Havana to complete the task.