Sertorius, who twenty years before had served under Titus Didius in Spain and knew the resources of the land, resolved to comply with the invitation, and, leaving behind a small detachment on the Mauretanian coast, embarked for Spain (about 674). The straits separating Spain and Africa were occupied by a Roman squadron commanded by Cotta; to steal through it was impossible; so Sertorius fought his way through and succeeded in reaching the Lusitanians. There were not more than twenty Lusitanian communities that placed themselves under his orders; and even of "Romans" he mustered only 2600 men, a considerable part of whom were deserters from the army of Pacciaecus or Africans armed after the Roman style. Sertorius saw that everything depended on his associating with the loose guerilla-bands a strong nucleus of troops possessing Roman organization and discipline: for this end he reinforced the band which he had brought with him by levying 4000 infantry and 700 cavalry, and with this one legion and the swarms of Spanish volunteers advanced against the Romans. The command in Further Spain was held by Lucius Fufidius, who through his absolute devotion to Sulla--well tried amidst the proscriptions--had risen from a subaltern to be propraetor; he was totally defeated on the Baetis; 2000 Romans covered the field of battle. Messengers in all haste summoned the governor of the adjoining province of the Ebro, Marcus Domitius Calvinus, to check the farther advance of the Sertorians; and there soon appeared (675) also the experienced general Quintus Metellus, sent by Sulla to relieve the incapable Fufidius in southern Spain. But they did not succeed in mastering the revolt. In the Ebro province not only was the army of Calvinus destroyed and he himself slain by the lieutenant of Sertorius, the quaestor Lucius Hirtuleius, but Lucius Manlius, the governor of Transalpine Gaul, who had crossed the Pyrenees with three legions to the help of his colleague, was totally defeated by the same brave leader. With difficulty Manlius escaped with a few men to Ilerda (Lerida) and thence to his province, losing on the march his whole baggage through a sudden attack of the Aquitanian tribes. In Further Spain Metellus penetrated into the Lusitanian territory; but Sertorius succeeded during the siege of Longobriga (not far from the mouth of the Tagus) in alluring a division under Aquinus into an ambush, and thereby compelling Metellus himself to raise the siege and to evacuate the Lusitanian territory. Sertorius followed him, defeated on the Anas (Guadiana) the corps of Thorius, and inflicted vast damage by guerilla warfare on the army of the commander-in- chief himself. Metellus, a methodical and somewhat clumsy tactician, was in despair as to this opponent, who obstinately declined a decisive battle, but cut off his supplies and communications and constantly hovered round him on all sides. Organizations of Sertorius