Letters deal primarily with Cayuse Indian War and Rogue River Indian War claims, but some also discuss territorial audits and finances. Series is arranged chronologically by date of correspondence. Reports show date, unit name or number, description of activities, and reporting officer's signature. Activities reported include maneuvers, training, military missions, roster changes, and combat. Subjects include the Cayuse Indian and Modoc Indian Wars.
Series is arranged chronologically by date of report.
Records include constitutions, by laws, citizen petitions for the formation of militia units, and correspondence. Series is arranged alphabetically by unit location.