Some historians have dismissed the Praetorian Guard as a parade-ground army of little military value. The Praetorians were certainly taunted as such by the soldiers of the Danubian legions during the civil war of 68–9. But Rankov argues that the Praetorians boasted a distinguished campaign-record that shows that their training and military effectiveness was far more impressive than those of merely ceremonial troops and amply justified their elite status. During the Julio-Claudian era (to 68), the Praetorians saw relatively little action in the field, as emperors only rarely led their armies in person. After that date, emperors led armies, and therefore deployed the Praetorians on campaign, much more frequently. The Praetorians were in the thick of the Emperor Domitian's wars, firstly in Germany and then on the Dacian front, where their prefect, Cornelius Fuscus was killed in action (87). Other examples include the Praetorians' prominent role in Trajan's Dacian Wars (101-6), as acknowledged on the friezes of Trajan's Column and the Adamklissi Tropaeum. Equally celebrated, on the Column of Marcus Aurelius, was the Praetorians' role in the Marcomannic Wars (166-80), in which two Guard prefects lost their lives. Even their final hour was wreathed in military glory: at the Battle of the Milvian Bridge (312), the Praetorians fought fiercely for their emperor Maxentius, trying to prevent the army of rival emperor Constantine I from crossing the river Tiber and entering Rome. Many perished fighting and others drowned when the makeshift pontoon-bridge they were using collapsed. Subsequently, the Praetorians paid the price of supporting the losing side: they were definitively disbanded, and their fortress demolished, by Constantine.