Armed with this magical blade, he continued his march into the wilds of Suruga, the haunt of the insurgent Ainos. But he found it no easy matter to bring these savage foes to an open fight. Fleeing before his army into the woods and mountains, they fought him from behind rocks and trees, it being their policy of warfare to inflict damage upon the enemy with as little loss as possible to themselves. Like the American Indians, these savages were used to all the forest wiles, quick to avail themselves of every sound or sign, able to make their way with ease through tangled thickets and pathless forests, and adepts in all the lore of wood and wild. As the army of Yamato pressed them too closely, they set fire to the dry underbrush which densely surrounded their lurking-place. The high wind carried the flames in roaring waves towards the Japanese army, which was in the most serious danger, for it was encamped amid tall, dry grass, which quickly became a sea of soaring flame. With yells of delight the Ainos gazed upon the imminent peril of their foes; but suddenly their exultation was changed to dismay. For at this moment of danger the Sun goddess appeared to Yamato, and at her suggestion he drew the sacred sword--Murakumo, or "Cloud Cluster"--and cut the grass that thickly rose around him. Before the magic of the blade fire itself was powerless, and the advancing flames turned and swept towards the enemy, many of whom were consumed, while the others fled in panic fear. Grateful to the gods for this timely aid, the hero changed the name of the sword, decreeing that thenceforth it should be known as Kusanagi, or "Grass-Mower." His route now led, by a mountain pathway, into the great plain of Eastern Japan, afterwards known as the Kuanto, which extends from the central ranges to the Pacific coast. Reaching the shores of the Bay of Yedo, he looked across from its southern headland to the opposite peninsula of Awa, whose hills seemed very close at hand. "It will be easy to cross that channel," he said: "it is but a trifle. Let the army embark." He did not know how treacherous was the navigation of this strait, whose weather is never to be trusted, and whose winds, tides, and currents are baffling and perilous. Embarking with his followers, he looked for an easy and rapid progress; but a terrible storm arose, tossing the boats so frightfully that death seemed their sure fate.