Stilicho hurried back to protect Honorius and the legions of Gaul and Britain were summoned to defend Italy. Honorius, at Milan, was besieged by Alaric, who marched into Liguria. Stilicho narrowly defeated Alaric at Pollentia, on the river Tanarus on Easter Day (6 April 402). Alaric retreated to Verona, where Stilicho attacked him again yet the battle was not entirely conclusive. The Visigoths were allowed to retreat back to Illyricum. In 405 Stilicho met an invasion of Italy led across the Danube by Radagaisus. They brought devastation to the heart of the Empire, until Stilicho defeated them in 406 and recruited most of them into his forces. Then, in 405/6, a tribal confederation, composed of Suevians, Vandals, Alans and Goths crossed the frozen Rhine and invaded Gaul.