Alfred's secret could not yet be safely revealed. Guthrum had not given over his search for him. Yet some of the more trusty of his subjects were told where he might be found, and a small band joined him in his morass-guarded isle. Gradually the news spread, and others sought the isle of Ethelingay, until a well-armed and sturdy band of followers surrounded the royal fugitive. This party must be fed. The island yielded little subsistence. The king was obliged to make foraging raids from his hiding-place. Now and then he met and defeated straggling parties of Danes, taking from them their spoils. At other times, when hard need pressed, he was forced to forage on his own subjects. Day by day the news went wider through Saxon homes, and more warriors sought their king. As the strength of his band increased, Alfred made more frequent and successful forays. The Danes began to find that resistance was not at an end. By Easter the king felt strong enough to take a more decided action. He had a wooden bridge thrown from the island to the shore, to facilitate the movements of his followers, while at its entrance was built a fort, to protect the island party against a Danish incursion. Such was the state of Alfred's fortunes and of England's hopes in the spring of 878. Three months before, all southern England, with the exception of Gloucester and its surrounding lands, had been his. Now his kingdom was a small island in the heart of a morass, his subjects a lurking band of faithful warriors, his subsistence what could be wrested from the strong hands of the foe. While matters went thus in Somerset, a storm of war gathered in Wales. Another of Ragnar's sons, Ubbo by name, had landed on the Welsh coast, and, carrying everything before him, was marching inland to join his victorious brother. He was too strong for the Saxons of that quarter to make head against him in the open field. Odun, the valiant ealderman who led them, fled, with his thanes and their followers, to the castle of Kwineth, a stronghold defended only by a loose wall of stones, in the Saxon fashion. But the fortress occupied the summit of a lofty rock, and bade defiance to assault. Ubbo saw this. He saw, also, that water must be wanting on that steep rock. He pitched his tents at its foot, and waited till thirst should compel a surrender of the garrison.