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The organization for the 7th mississippi Infazntry Battalion is:

Mississippi 7th Infantry Battalion
Also Know as: 8th Infantry Battalion
Organization:
Organized in the summer of 1862. Regiment surrendered at Vicksburg, Warren County, Mississippi on July 4, 1863. Paroled at Vicksburg, Warren County, Mississippi in July 1863. Declared exchanged on September 12, 1863. Surrendered by Lieutenant Richard Taylor, commanding the Department of Alabama, Mississippi, and East Louisiana, at Citronelle, Alabama on May 4, 1865.
First Commander: James S. Terral (Lieutenant Colonel)
Field Officers: L. B. Pardue (Lieutenant Colonel), Joel E. Welborn (Major)
Assignments:
Green's Brigade, Little's-Hebert's Division, Price's Corps, Army of West Tennessee, Department #2 (September-October, 1862)
Green's Brigade, Hebert's Division, Price's Corps, Army of West Tennessee, Department of Mississipi and East Louisiana (October, 1862)
Hebert's Brigade, Maury's Division, Price's Corps, Army of West Tennessee, Department of Mississippi and East Louisiana (October -December 1862)
Hebert's Brigade, Maury's Division, 2nd Corps, Army of North Mississippi, Department of Misissippi and East Louisiana (December 1862-January 1863)
Hebert's Brigade, Maury's Division, 2nd Military District, Department of Mississippi and East Louisiana (January-April 1863)
Hebert's Brigade, Maury's-Forney's Division, Department of Misissippi and East Louisiana (April-July 1863)
Mackall's Brigade, Department of the Gulf (February 1864)
Sears' Brigade, Department of Alabama, Mississippi and East Louisiana (March-May 1864)
Sears' Brigade, Army of Mississippi (May 1864)
Sears' Brigade, French's Division, Army of Mississippi (May-July 1864)
Sears' Brigade, French's Division, 3rd Corps, Army of Tennessee (July 1864-January 1865)
Sears' Brigade, French's Division, District of the Gulf, Department of Alabama, Mississippi and East Louisiana (January-April 1865)
Sears' Brigade, French's Division, of the Gulf, Department of Alabama, Mississippi and East Louisiana (April-May 1865)
Battles:
Iuka (September 19, 1862)
Corinth (October 3-4, 1862)
Vicksburg Campaign (May-July 1863)
Vicksburg Siege (May-July 1863)
Atlanta Campaign (May-September 1864)
Cassville (May 19-22, 1864)
New Hope Church (May 25-June 4, 1864)
Lattimer's Mills (June 20, 1864)
Kennesaw Mountain (June 27, 1864)
Atlanta Siege (July-September 1864)
Smyrna Campground (July 4, 1864)
Chattahoochee River (July 5-17, 1864)
Atlanta (July 22, 1864)
Peach Tree Creek (July 20, 1864)
Ezra Church (July 28, 1864)
Jonesboro (August 31-September 1, 1864)
Lovejoy's Station (September 2-5, 1864)
Allatoona (October 5, 1864)
Franklin (November 30, 1864)
Nashville (December 1-16, 1864)
Mobile (March 17-April 12, 1865)
Sources:
Sifakis, Stewart, Compendium of the Confederate Armies: Mississippi, Facts On File: Inc., New York, 1992, p. 82-84.