Vespasian's troops in Pannonia aren't willing to just sit on their hands. They want glory and booty. And they don't want Vitellius to have a chance to build up his forces. Antonius Primus, commander of 7 Galbiana, believed that Otho had thrown away his victory by procrastination and faint-heartedness, and he called for an immediate invasion and it is approved - without waiting for confirmation from Vespasian. Meanwhile, in Vitellius' camp, the rivalry between Caecina and Valens had been intensifying, and Caecina decided it was time to change sides.
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