before the family returned to Rome, where Drusus reported to Augustus. Drusus was given the honor of an ovation, and for the second time, Augustus closed the doors of the Temple of Janus, signifying that the whole Roman world was then at peace. Drusus was granted the office of proconsul for the following year. In 10 BC, the Chatti joined with the Sicambri and attacked Drusus' camp, but they were driven back. Drusus pursued them, proceeding from the sites of present-day Mainz and Rödgen, where he set up a base of supply, to Hedemünden, where a strong new camp was established. Around this time, the canny Marcomannic king Maroboduus responded to the Roman incursion by relocating his people en masse to Bohemia. In summer of 10 BC, Drusus left the field in order to return to Lugdunum, where he inaugurated the sanctuary of the Three Gaulish provinces at Condate on 1 August. Augustus and Tiberius were in Lugdunum for this occasion (when Drusus' youngest son Claudius was born), and afterwards Drusus accompanied them back to Rome. Drusus easily won election as consul for the year 9 BC. Once more he left the city before assuming office. His consulship conferred the chance for Drusus to attain Rome's highest and rarest military honor, the spolia opima, or spoils of an enemy chieftain slain personally by an opposing Roman general who was fighting (as consuls did) under his own auspices. He quickly returned to the field, stopping to confer with his staff at Lugdunum and to dedicate a temple to Caesar Augustus at Andemantunnum, before rejoining his command at Mainz, from which the year's expedition departed in early spring. Drusus led the army via Rödgen through the territories of the Marsi and Cherusci until he even crossed the river Elbe. Here he is said to have seen an apparition of a Germanic woman who warned him against proceeding farther and that his death was near. Drusus turned back, erecting a trophy to commemorate his reaching the Elbe, perhaps on the site of Dresden or Magdeburg. Drusus had sought out multiple Germanic (at least three) chieftains during his campaigns in Germany (12 BC–9 BC), engaging them in "dazzling displays of single combat". The sources are ambiguous, but suggest that he could have potentially taken the spolia opima from a Germanic king, thus becoming the fourth and final Roman to gain this honor. Regardless of