When they did come, they confirmed what the old prophet had said. "See that the waters be not confined within the basin of the lake," was the message of Apollo's priestess: "see that they take not their own course and run into the sea. Thou shalt take the water out of the lake, and thou shalt turn it to the watering of the fields, and thou shalt make courses for it till it be spent and come to nothing." What all this could possibly have to do with the siege of Veii the oracle did not say. But the people of the past were not given to ask such inconvenient questions. The oracle was supposed to know better than they, so workmen were sent with orders to bore through the sides of the hills and make a passage for the water. This tunnel was made, and the waters of the lake were drawn off, and divided into many courses, being given the duty of watering the fields of the Romans. In this way the water of the lake was all used up, and no drop of it flowed to the sea. Then the Romans knew that it was the will of the gods that Veii should be theirs. Despite all this, the army of Rome must have met with serious difficulties and dangers at Veii, for the senate chose a dictator to conduct the war. This was their ablest and most famous man, Marcus Furius Camillus, a leader among the aristocrats, and a statesman of distinguished ability. Under the command of Camillus the army hotly pressed the siege. So straitened became the Veientians that they sent envoys to Rome to beg for peace. The senate refused. In reply, one of the chief men of the embassy, who was a skilled prophet, rebuked the Romans for their arrogance, and predicted coming retribution. "You heed neither the wrath of the gods nor the vengeance of men," he said. "Yet the gods shall requite you for your pride; as you destroy our country, so shall you shortly after lose your own." This prediction was verified before many years in the invasion of the Gauls and the destruction of Rome,--a tale which we have next to tell. Camillus, finding that Veii was not to be taken by assault over its walls, began to approach it from below. Men were set to dig an underground tunnel, which should pass beneath the walls, and come to the surface again in the Temple of Juno, which stood in the citadel of Veii. Night and day they worked, and the tunnel was in course of time completed, though the ground was not opened at its inner extremity. Then many Romans came to the camp through desire to have a share in the spoil of Veii. A tenth part of this spoil was vowed by Camillus to Apollo, in reward for his oracle; and the dictator also prayed to Juno, the goddess of Veii, begging her to desert this city and follow the Romans home, where a temple worthy of her dignity should be built.