This document provides guidance on researching ancestors who served in the Civil War. It outlines basic biographical information to collect, such as name, age, residence and unit. Useful resources include census records from 1865 and 1890, service records, regimental histories and pension papers. The document recommends beginning with basic genealogy books and searching the New York State Adjutant General's reports to identify potential units. It also discusses the Civil War Soldier and Sailor System database and provides local resources like the Rochester Public Library's Civil War master index and town historians. A case study example illustrates how names can be creatively spelled.