Landis' Company, Missouri Light Artillery - Confederate
Landis' Company was formed early in 1862. It served throughout the Vicksburg siege and was captured on July 4, 1863. After the exchange, it was not reorganized. Captain John C. Landis was in command. 
Companies in this Regiment with the Counties of Origin
Men often enlisted in a company recruited in the counties where they lived though not always. After many battles, companies might be combined because so many men were killed or wounded. However if you are unsure which company your ancestor was in, try the company recruited in his county first.
The Landis Battery - Captain John C. Landis
Landis Battery - Captain John S. Landis
The information about the companies is from Kenneth E. Weant's Civil War Records: Missouri State Guard and Confederate Artillery Batteries plus William Quantrill's Company and Miscellaneous Records, Volume 1, pages 62-65 and 66-67, (Arlington, Texas : K.E. Weant, 2009). FHL book 977.8 M2wkq v. 1.
- Beginning United States Civil War Research gives steps for finding information about a Civil War soldier or sailor. It covers the major records that should be used. Additional records are described in 'Florida in the Civil War' and 'United States Civil War, 1861 to 1865' (see below).
- National Park Service, The Civil War Soldiers and Sailors System, is searchable by soldier's name and state. It contains basic facts about soldiers on both sides of the Civil War, a list of regiments, descriptions of significant battles, sources of the information, and suggestions for where to find additional information.
- Missouri in the Civil War describes many Confederate and Union sources, specifically for Florida, and how to find them.. These include compiled service records, pension records, rosters, cemetery records, Internet databases, published books, etc.
- United States Civil War, 1861 to 1865 describes and explains United States and Confederate States records, rather than state records, and how to find them. These include veterans’ censuses, compiled service records, pension records, rosters, cemetery records, Internet databases, published books, etc.
- National Park Service, The Civil War Soldiers and Sailors System, (accessed 9 August 2011).