Ingvar and Hubba now pass from the scene, though Hubba reappears for a brief space some years later. The army that marched upon Wessex was led by Halfdene, another son of Ragnar, a second king named Baegsceg, and several jarls--a division of command which could hardly make for efficiency. The defence of Wessex was in capable hands. The gallant King Aethelred was admirably assisted by his brother Alfred,[C] soon to be the greatest of English kings. Everything possible appears to have been done to facilitate mobilization, for the Wessex men were in the field with the least delay. Better still, there was no standing on the defensive; the royal brothers appear determined from the first to attack their foes and drive them out of the country. [C] The name Alfred has become so much a part of English history that the time-honoured orthography is retained. The Danish army advanced from Thetford to the Thames, contemptuously ignoring Mercia, and entrenched itself at Reading in the triangle formed by the junction of the Kennet with the Thames. The kings appear to have established this camp while the jarls began to ravage. But they were quickly to learn that they could not play the game with impunity. Three days after their arrival two of the jarls were attacked by the Berkshire _fyrd_, under Ealdorman Aethelwulf, at Englefield Green, in Windsor Forest, and defeated; one of them was slain. Four days afterwards the King and Alfred arrived at Reading unexpectedly with the army of Wessex. The Northmen were off their guard, and were driven back within the palisades. But when the English attempted to storm the camp they were heavily repulsed, with the loss of the brave Aethelwulf, and obliged to retreat westward.