Furough: A leave of absence, military term for vacation

You can see a Regimental Casualty Analysis at the American Civil War Research Database, a subscription service for which you should be able to obtain a short term free trial.

http://www.civilwardata.com/active/hdsquery.dll?RegimentCasualty?800&C

See also:

https://www.google.com/search?client=safari&rls=en&q=42nd+virginia+infantry&oq=42nd+Virgi&gs_l=serp.1.0.0l2j0i22i30l7.3896.9505.0.11533.10.8.0.2.2.0.246.947.0j6j1.7.0.msedr...0...1c.1.62.serp..1.9.953.mnvqf2zB4lw