"'Tis called the fen of Agnefit, O king," replied the saga-man,
pointing toward where it lay.

"Why, then, my Rane," asked the boy, "may we not cut our way out
through that lowland fen, to the open sea and liberty?"

"'Tis Odin's own device," cried the delighted helmsman, catching at
his young chief's great plan. "Ho, war-wolves all, bite ye your way
through the Swedish fens! Up with the serpent banner, and farewell
to Olaf the Swede!"

It seemed a narrow chance, but it was the only one. Fortune favored
the boy viking. Heavy rains had flooded the lands that slope down
to the Maelar Lake; in the dead of night the Swedish captives and
stout Norse oarsmen were set to work, and before daybreak an open
cut had been made in the lowlands beneath Agnefit, or the "Rock of
King Agne," where, by the town of Sodertelje, the vikings' canal
is still shown to travellers; the waters of the lake came rushing
through the cut, and an open sea-strait awaited young Olaf's fleet.

"Unship the rudder; hoist the sail aloft!" commanded Bane the
helmsman. "Sound war-horns all! Skoal to the Viking; skoal to the
wise young Olaf!"

A strong breeze blew astern; the Norse rowers steered the rudderless
ships with their long oars, and with a mighty rush, through the new
canal and over all the shallows, out into the great Norrstrom, or
North Stream, as the Baltic Sea was called, the fleet passed in
safety while the loud war-horns blew the notes of triumph.