Catching the arrow on his shield, Sigurd flung a spear in reply, with all his force. The weapon struck full on the shield that covered Thorkel, pierced it, and Thorkel staggered back. A fresh attack drew Sigurd's attention, however, and when he looked for Thorkel again, his ship had withdrawn. Now there happened a strange and terrible thing.
The day had steadily grown darker, with a rising wind. Suddenly a blaze of lightning fell athwart the sky, and Jarl Hakon's ship stood forth in the sight of all, wrapped in lambent flame, the Jarl himself standing triumphantly in the stern, grasping a hammer like that of Thor.
A cry of horror arose from the Jomsvikings, who took the figure for that of the war god; and the lightning was followed by a thick hail, the stones as large as eggs, which burst full in the faces of the Jomsborg men.
"Thor with us! The gods fight for us!" An exultant shout pealed upward from the Norse host, who pressed onward with renewed vigor. All at once a cry broke from Vagn, a cry of anger and dismay.
"Sigurd! Look yonder!"
There behind them Jarl Sigvald had cut the lashings of his ships and was fleeing! The Jomsborg men seemed wild with terror, for now they thought that Hakon was right, that Thor and Odin were in truth fighting for him, and they lost heart.
Sigvald's ship cut through the press close behind that of Vagn, and as it passed the boy called out:
"Sigvald! Turn and fight! Turn and fight!"
But Sigvald only urged his men to greater efforts, and the sail was run up. At this Vagn seized a spear from the deck, and with a curse hurled it at the fleeing Jarl. The spear missed him, but struck down the helmsman at his side, and the ship was gone from sight in a moment.
Louder and louder pealed the war-horns of Hakon, as ship after ship followed Sigvald in his flight. Vagn's men gave one angry yell, then fought on in silence. Presently their attackers drew back for breathing-space, and as they did so the boys saw Bui's ships close at hand.