Panic-stricken couriers brought to Fabius Valens the news that 14 Otho’s fleet was threatening the province of Narbonese Gaul, which had sworn allegiance to Vitellius.  Representatives from the Roman colonies also arrived beseeching his aid.  He dispatched two cohorts of the Tungri[238] and four troops of horse, together with the entire cavalry regiment of the Treviri.[239] This force was put under the command of Julius Classicus,[240] and part of it was detained in the colony of Forum Julii,[241] since if the whole force marched inland and the sea-board were left unprotected Otho’s fleet would swoop down at once.  Twelve troops of cavalry and a picked body of auxiliaries marched against the enemy:  these were reinforced by a Ligurian cohort which had long garrisoned this district, and a draft of five hundred Pannonian recruits who had not yet joined their legion.[242] The engagement began promptly.  Their line was so arranged that some of the marines, reinforced by the peasants, held the rising ground by the sea, while the Guards filled the level space between the hills and the shore.  The fleet, acting in conjunction with the land force, was ready to play its part in the battle, and extended a threatening front facing the coast.  The Vitellians, weaker in infantry, put their trust in their horse.  The mountaineers[243] were posted on the neighbouring heights, and the auxiliaries massed in close order behind the cavalry.  The Treviran cavalry rashly charged the enemy, and meeting Otho’s guards in front were simultaneously assailed in the flank by the peasants, flinging stones.  This they could do well enough; and, drafted among the regulars, they all, bold and timid alike, showed the same courage in the hour of victory.  Panic struck the defeated Vitellians when the fleet began to harass their rear.  They were now surrounded, and would have been entirely destroyed had not darkness arrested the victors and sheltered their flight.  But though beaten 15 the Vitellians were not cowed.  Calling up reinforcements, they suddenly attacked while the unsuspecting enemy were taking their ease after the victory.  They killed the pickets, broke into the camp and terrified the sailors.  In time the panic subsided.  The Othonians seized a hill, defended their position, and eventually assumed the offensive.  The slaughter was frightful.  The officers commanding the Tungri, after a long defence of their position, fell beneath a shower of weapons.  The victory also cost the Othonians heavy loss, for the enemy’s cavalry rallied and cut off all who rashly ventured too far in pursuit.  So they agreed to a sort of armistice.  As a safeguard against sudden raids either by the fleet on the one side or the cavalry on the other, the Vitellians retired to Antipolis,[244] a town of the Narbonese province, and the Othonians to Albingaunum[245] in the interior of Liguria.