Perhaps you should try some spelling variations:
york volunteer » form volunteer, worker volunteer, mock volunteers
6th regiment » 60th regiment, 67th regiment, 76th regiment
ist regiment » first regiment, 71st regiment, his regiment
9th regiment » 89th regiment, 29th regiment, 11th regiment

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: 7th new york volunteer ((((6th regiment) OR (ist regiment))) OR (9th regiment)).
• Adding a wildcard symbol may retrieve word variants: 7th new york volunteer ((((6th regiment) or (ist regiment))) or (9th regiment))*.