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The following Confederate States Army units and commanders fought in the Siege of Petersburg of the American Civil War. The following Order of Battle is the Organization from the Confederate forces near Petersburg of October 27, 1864.

Smith's Artillery Battalion
Epes' (Virginia) Artillery [Chesterfield Johnson’s Virginia Artillery]
Kevill's (Virginia) Artillery-[United Virginia Artillery]
Battery Dantzler

References
http://www.brettschulte.net/CWBlog/regimental-level-orders-of-battle/

Mr. Shulte offers some great in depth research covering unit histories, order of battle, various campaigns [particularly Petersburg] I strongly urge you to look at what he has put together.