The Rulers of the Lakes by Joseph Altsheler

Historical novel from the French and Indian War series. The French and Indian War just after Braddocks defeat is again the background. Young Robert Lennox and his friend Tayoga, an Onondaga Indian, undertake to make a dangerous journey through the northern wilderness to warn the garrison and settlers gathered at Fort Refuge of the hostile forces. Afterwards they join the army as scouts, preceding it on an expedition to Lake George and Lake Champlain, where they engage in many fierce encounters. The story concludes with the battle of Lake George, in which the Colonists win their first great success of the war. According to Wikipedia: Joseph Alexander Altsheler (1862 - 1919), was an American author of popular juvenile historical fiction. Altsheler was born in Three Springs, Kentucky to Joseph and Louise Altsheler. In 1885, he took a job at the Louisville Courier-Journal as a reporter and later, an editor. He started working for the New York World in 1892, first as the papers Hawaiian correspondent and then as the editor of the Worlds tri-weekly magazine. Due to a lack of suitable stories, he began writing childrens stories for the magazine.