Realizing his situation, Maroboduus requested Roman aid. It had been two years since the Marcommani refused to help the Romans against the forces of Arminius, and so Tiberius refused to send aid. Instead, Tiberius sent Drusus to further Roman interests at Maroboduus' expense as he knew the Marcomanni were vulnerable. During the summer of 18, Drusus received intelligence from a former captive of Maroboduus, Catualda, that Maroboduus was weak and that it was a good time to attack. Hence, Drusus led a powerful force into the heart of the Marcomanni, and stormed their royal stronghold. Maroboduus fled, but was forced to seek asylum in Rome, which Tiberius granted. Later, Catualda lost a battle against the Hermunduri, and he too was granted asylum. The Senate decreed that Drusus be given an ovation for his success, which he received on his return to Rome on 28 May 20.