Confirming and adding to Virgil's input, there is also a Sergeant T. T. SCANLAN listed in Booth's Records who was enrolled in D. H. Mark's Company of the 22nd/23rd Louisiana Infantry. He was enrolled at New Orleans on September 3, 1861 and present on the rolls through February 1862. No record of Louisiana Confederate service after that is indicated.

According to Dr. Arthur W. Bergeron's "Guide to Louisiana Confederate Military Units 1861-1865" (LSU Press, 1989), the 22nd/23rd Louisiana Infantry was formed in January 1862 by combining four companies of the Orleans Artillery Battalion in the Louisiana State Militia with six independent companies recruited in Orleans Parish. Captain David H. Marks commanded Company G of the 22nd/23rd Louisiana Infantry from Orleans Parish while his brother Captain Washington Marks commanded Company H. Collectively these two companies were known as the Twiggs Rifles. When Washington Marks was promoted to Major of the regiment on May 2, 1863, his brother Marion H. Marks succeeded him in command of Company H. So much for the Marks brothers!

Dr. Bergeron further states that when General Lovell ordered the evacuation of New Orleans, most of these companies of the 22nd/23rd Louisiana disbanded and the men went home rather than accept orders to serve outside the state of Louisiana. Federal occupation of New Orleans began May 1, 1862 and eventually those men who remained at home were subjected to Federal conscription. There were several New Orleans based Federal army units recruited/conscripted from among the New Orleans white population. Those who evacuated New Orleans in 1862 and reported to Camp Moore have an additional military history with the 22nd/23rd Louisiana serving in the defense of Vicksburg. Since Sergeant T. T. SCANLAN's service record ends after February 1862 and his name does not appear in any other Louisiana Confederate service, he is probably one of those men who remained in New Orleans under occupation.

Private Thomas SCANLAN/SCANLON of Company D [Orleans Parish], 7th Louisiana Infantry went with that regiment to Virginia. He disappears from the records after February 1864. Having been absent sick from March 1863 through November 1863, he may never had recovered his health.

There are at least two men to choose from in these several records: (1) T. T. SCANLAN/SCANLON and (2) Thomas SCANLAN. You need to research the Orleans Parish 1860 Federal Census and consult family traditions to sort out which of these men could be your ancestor.

If the man in the 22nd/23rd Louisiana is the ancestor you seek, be sure to search Federal army records for 1862 - 1865 service. White Louisiana units in the Federal army were the 1st and 2nd Louisiana Cavalry regiments, the 1st and 2nd Louisiana Infantry regiments, and the 1st and 2nd Regiments of New Orleans Infantry. I don't have access to a list of names, but Frederick H. Dyer's "A Compendium of the War of the Rebellion" [Morningside Bookshop Reprint, 1979] contains a brief narrative history of each of these units.