Columbcille warned him that if he persistently refused to show mercy to his captive, the punishment of God would overtake him, and he would die before Columba himself left the country, but Broichem was not to be moved. Not long afterwards Columba set out on his return journey to Iona, but he had hardly reached Loch Ness when he was overtaken by two messengers from the high-priest beseeching him to take pity on their master, who had been suddenly taken ill and was in danger of death. They were assured that the Druid would recover, but only on condition that he set the Irish maiden at liberty. She was at once sent to Columba, who found means for her return to her country and her people. As for Broichem, he was more incensed than ever against the Christians, and considered how he could best check their growing influence with the people. The Druids seem to have had a certain power over the elements, perhaps through the evil spirits whom they worshipped. They had heard of and seen the miracles worked by Columba, and resolved to show how superior their powers of magic were to his. On the day fixed for the departure of the missionaries, Broichem threatened that he would cause a thick fog and a contrary wind to arise, so that it would be impossible for them to embark. The people were gathered in crowds to bid farewell to Columba, when to their great consternation the Druid's threat was fulfilled. The fog was dense and the unfavourable wind blew stormily. This time at least they had triumphed, or so they thought, and they did not attempt to conceal their joy. But Columba, nothing daunted, bade the mariners spread their sails, and the awe-stricken crowd on the shore beheld the boat flying swiftly westwards to Iona in the teeth of the contrary wind, as if it had been altogether in their favour. The departure was not to be for long. Again and again Columba revisited the mainland to strengthen and confirm the faith of his converts; and in course of time churches and monasteries sprang up amongst the forests and the mountains of Caledonia, little strongholds of Christianity the beneficent influence of which was soon to penetrate throughout the length and breadth of the land. Columba had many faithful helpers in his missionary labours. Malruve, a kinsman and countryman of his own, soon followed him to Iona to share in his work among the Picts. He became abbot of Appercrossan, now Applecross, on the north-west coast of Caledonia, and suffered the "red martyrdom" some years after the death of Columbcille, at the hands of Norwegian pirates. St. Canice, the companion of Columba and Ciaran at Clonard and Glasnevin, also followed his old friend across the sea. He founded a monastery and a church on the shore of Loch Lagan, and another in Fifeshire. St. Kenneth, as the Scotch called him, was noted for his eloquence and learning, and wrote a commentary on the four Gospels which was much valued in his day.