It was an attempt by a huge Portuguese army under the command of Joanne Mendes de Vasconcelos , governor of Alentejo , to capture Conquering the Spanish city of Badajoz , which was the headquarters of the Spanish Army of Extremadura .

So in 1658 , Mendes de Vasconcelos gathered Come_together an army at Elvas and advanced Cause_to_make_progress on Badajoz .

Mendes de Vasconcelos , the Portuguese commander , was stripped Removing of his rank and imprisoned Arrest for his failure .