f 677 become by treaty or force
dependent on Sertorius, and the district on the upper and middle
Ebro thenceforth continued the main stay of his power. Even
the apprehension, which the fresh Roman force and the celebrated name
of the general excited in the army of the insurgents, had a salutary
effect on it. Marcus Perpenna, who hitherto as the equal
of Sertorius in rank had claimed an independent command over the force
which he had brought with him from Liguria, was, on the news
of the arrival of Pompeius in Spain, compelled by his soldiers
to place himself under the orders of his abler colleague.

For the campaign of 678 Sertorius again employed the corps
of Hirtuleius against Metellus, while Perpenna with a strong army
took up his position along the lower course of the Ebro to prevent
Pompeius from crossing the river, if he should march, as was
to be expected, in a southerly direction with the view of effecting
a junction with Metellus, and along the coast for the sake
of procuring supplies for his troops. The corps of Gaius Herennius
was destined to the immediate support of Perpenna; farther inland
on the upper Ebro, Sertorius in person prosecuted meanwhile
the subjugation of several districts friendly to Rome, and held himself
at the same time ready to hasten according to circumstances
to the aid of Perpenna or Hirtuleius. It was still his intention
to avoid any pitched battle, and to annoy the enemy by petty
conflicts and cutting off supplies.

Pompeius Defeated

Pompeius, however, forced the passage of the Ebro against Perpenna
and took up a position on the river Pallantias, near Saguntum,
whence, as we have already said, the Sertorians maintained their
communications with Italy and the east. It was time that Sertorius
should appear in person, and throw the superiority of his numbers
and of his genius into the scale against the greater excellence
of the soldiers of his opponent. For a considerable time the struggle
was concentrated around the town of Lauro (on the Xucar, south
of Valencia), which had declared for Pompeius and was on that account
besieged by Sertorius. Pompeius exerted himself to the utmost
to relieve it; but, after several of his divisions had already been
assailed separately and cut to pieces, the great warrior found
himself--just when he thought that he had surrounded the Sertorians,
and when he had already invited the besieged to be spectators
of the capture of the besieging army--