Family history and genealogical information about the descendants of John O'Gallaher (or Gallaher) and Margaret (surname unknown). They lived in County Donegal, Ireland. Three of their five children immigrated to America ca. 1758 and settled in Pennsylvania. Emphasis in given to their son James who immigrated to America and first lived in Mifflin Station, Pennsylvania. James later settled in the state of Tennessee. Descendants of John and Margaret Gallaher lived primarily in Pennsylvania, Tennessee, Texas, Missouri and Oklahoma.

This book is a thorough study of all known guerrilla operations in Civil War Missouri between September 1864 and June 1865. It explores different tactics each side attempted to gain advantage over each other, with regional differences as influenced by the personalities of local commanders. The author utilizes both well-known and obscure sources (including military and government records, private accounts, county and other local histories, period and later newspapers, and secondary sources published after the war) to identify which Southern partisan leaders and groups operated in which areas of Missouri, and how their kinds of warfare evolved. This work presents the actions of Southern guerrilla forces and Confederate behind-Union-lines recruiters chronologically by region so that readers may see the relationship of seemingly isolated events to other events. The book also studies the counteractions of an array of different types of Union troops fighting guerrillas in Missouri to show how differences in training, leadership and experience affected actions in the field.