Constantine was furious after his foederati had abandoned him at Saguntum and planned to return to Gaul. While it was true, this campaign was not going as well as he had initially planned, they were far from being defeated.
Or so he believed. Constantine's plan was to fall back to the regions he had conquered and force every man capable of wielding a spear into his ranks. He had bled too much, and fought too long to lose Hispania after a series of protracted sieges. He swore he would be back with a Vengeance.
As for Hagen, he quickly gathered his Frankish Warriors and departed for the Pyrenees. There was nothing left in Hispania for him, and he intended to raid and ravage Constantine's lands for all the wealth they had. Or so that was the plan, however the moment he and his army of a few thousand foederati arrived at the foothills they had passed through to get into these lands, they noticed a serious problem.