The Romans' main objective was to capture the Numidian king Jugurtha who was reported to be in Thala, but he escaped before the legions reached the fortress town.
Although the Senate was the executor of Micipsa's will, they now allowed themselves to be bribed by Jugurtha into overlooking his crimes, and organized a commission, led by the ex-Consul Lucius Opimius, to fairly divide Numidia between the remaining contestants in 116 BC.
Jugurtha bribed the Roman officials in the commission and was allotted the more fertile and populous western half of Numidia, while Adherbal received the east.
The latter ignored the demand, and the Senate sent a second commission, this time headed by Marcus Scaurus, a respected member of the aristocracy, to threaten the Numidian king into submission.
The king, pretending to be open to discussion, protracted negotiations with Scaurus long enough for Cirta to run out of provisions and hope of relief.
But the deaths of Roman citizens caused an immediate furor among the commoners at home, and the Senate, threatened by the popular tribune Gaius Memmius, finally declared war on Jugurtha in 111 BC.
After Postumius' defeat, the Senate finally shook itself from its lethargy, appointing as commander in Africa the plebeian noble Quintus Caecilius Metellus, who had a reputation for integrity and courage.
The fortress town was situated in a waterless wasteland, but Metellus was not deterred by this, he commandeered pack animals, saddled them with water sacks and marched his army through the desert to Thala.
[2] Metellus' army besieged Thala for forty days; assaulting the walls with ladders, battering the gates and constructing great mounds to provide covering fire for his troops.