Others who entered never came out again. The priests said they had been seized by the juju, and the blood-red river seemed to show this, but a dye had been thrown in to colour the water. These persons were taken far away in secret, and sold into slavery. Any that were not of much value were slain and eaten in the cannibal feasts. Now that Ma's dream of conquering Okoyong had come true, she was dreaming other dreams, and the most fascinating of these was to go to this terrible cannibal country and put down the evil doings of the natives. She told the slave-dealers about it. "All right, Ma," they said, for they liked her, and admired her courage. "We, who know you, will be glad to welcome you; but we are not sure about the priests--they may kill you." "I will risk that," she said; "as soon as I can get away from here you will see me." In order to find out more about the tribes, she sometimes went far up the Cross River in a canoe, stopping wherever she could get shelter. On one of her journeys, when she had some of the house-children with her, the canoe was attacked by a huge hippopotamus. It rushed at the canoe, and tried to overthrow it. The men thrust their paddles down its throat and beat it, but it kept savagely nosing and gripping the frail vessel. Great was the excitement. Its jaws were snapping, the water was in a whirl of foam, the men were shouting and laying about them with their paddles, the girls were screaming, Ma was sometimes praying and sometimes giving orders. At last the canoe was swung clear, and paddled swiftly away. The story of this adventure is still told in Calabar, and if you ask Dan, one of Ma's children, about it, he will say, "Once, when Ma was travelling in a canoe, she was attacked by hippopotamuses, but when they looked inside the canoe and saw her, they all ran away!" What Ma saw and heard made her all a-quiver to go into these strange lands, but she would not leave the Okoyong people until some one came to take her place. The Mission had no other lady to send, and so she could only watch and pray and wait. Matters became worse. The Aros hated the white rule, and would not submit to it. They tried to prevent the Government opening up their country to order and justice and peace, and would not allow the officials to enter it; they blocked the river so that no white vessel, or native one either, could pass; they went on with their slave-hunting and cannibalism. At last the Government lost patience. "We must teach them a lesson," they said. So a warning went to all the missionaries along the banks of the river to come down to Calabar at once. Ma Slessor did not like the order. "Everything is peaceful in Okoyong," she said. "My people won't fight." The Government said they knew that, but her life was too precious to risk, and they sent a special steamer for her and the children.