Rome's African ally, King Masinissa of Numidia, exploited the prohibition on Carthage waging war to repeatedly raid and seize Carthaginian territory with impunity. In 149 BC, fifty years after the end of the Second Punic War, Carthage sent an army, under Hasdrubal, against Masinissa, the treaty notwithstanding. The campaign ended in disaster at the Battle of Oroscopa and anti-Carthaginian factions in Rome used the illicit military action as a pretext to prepare a punitive expedition. The Third Punic War began later in 149 BC when a large Roman army landed in North Africa and besieged Carthage. In the spring of 146 BC the Romans launched their final assault, systematically destroying the city and killing its inhabitants; 50,000 survivors were sold into slavery. The formerly Carthaginian territories became the Roman province of Africa. It was a century before the site of Carthage was rebuilt as a Roman city.