In AD 6, several regiments of Daesitiates, natives of area that now comprises central Bosnia and Herzegovina, led by Bato the Daesitiate (Bato I), were gathered in one place to prepare to join Augustus's stepson and senior military commander Tiberius in a war against the Germans. Instead, the Daesitiates mutinied and defeated a Roman force sent against them. The Daesitiates were soon joined by the Breuci led by Bato of the Breuci (Bato II), another community inhabiting the region between the rivers Sava and Drava in modern Croatia. They gave battle to a second Roman force from Moesia led by Caecina Severus (the governor of Moesia). Despite their defeat, they inflicted heavy casualties at the Battle of Sirmium. The rebels were now joined by a large number of other communities. At risk was t