Military history of the Revolt of the Comuneros
Military conflict in the Revolt of the Comuneros (Spanish: Guerra de las Comunidades de Castilla) spanned from 1520 to 1521. The Revolt began with mobs of urban workers attacking government officials, grew to low-level combat between small militias, and eventually saw massed armies fighting battles and sieges.
Source: Wikipedia — Military history of the Revolt of the Comuneros (CC BY-SA 4.0)