 After his term as consul, Didius was assigned to govern the province of Hispania Citerior as a proconsul, where he governed from 97 BC to 93 BC.Nearly his entire proconsular term in Spain was spent at war with the Celtiberi.In the four years Didius governed Spain he achieved multiple victories and is said to have slain 20,000 Arevaci, quelled the rebellious city of Termes (today Tiermes in the province of Soria), and besieged Colenda for nine months, after which time the city fell and the women and children were sold into slavery.