On a Sword's Edge - William the Bold, #1

Scotland. 1263. The scent of rain mingles with the smoke of campfires as word spreads: the Norse are coming.As tempers rise between King Alexander and the Norse King Haakon, at the center of it all is sixteen-year-old William Douglas, a squire in service to the Lord High Sir John Stewart. When Haakon's fearsome fleet is espied approaching Scotland's shores, carrying the greatest invasion force the Norse have ever mustered, the dread of battle settles over the land.
Summoned to Ayr Castle, William joins the Scottish forces in a desperate defense. Now tasked with serving his newly knighted brother, Hugh, William has little time to dwell on the fear - or thrill - of his first real taste of war. And once the Norse's menacing line of ships finally touches shore, Scotland's fate may rest on more than noble titles and knightly deeds- it'll take the mettle of every soul on the ground for them to triumph.
Set against the wind-swept coast of medieval Scotland, On a Sword's Edge takes you right into the center of The Battle of Largs from the perspective of a mere - yet fearless - squire.