Karla Johnson of Ardmore OK,
I found several in the 1st Texas Heavy Artillery that may be your "Lum" Johnson. "Lum" is possibly a nickname for Columbus but nicknames do not have to be an abbreviated name.
The following names were collected from the Sailors and Soldiers website by entering "Johnson," leave first name blank, "Confederate," "Texas," and "artillery."
http://www.itd.nps.gov/cwss/soldiers.cfm
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2
Johnson, A.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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4
Johnson, Al
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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9
Johnson, E. D.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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10
Johnson, Edward
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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11
Johnson, F. D.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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12
Johnson, G. W.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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13
Johnson, H.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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14
Johnson, H. V.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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15
Johnson, Henry
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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16
Johnson, J.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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17
Johnson, J.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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23
Johnson, N. G.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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24
Johnson, N. J.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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26
Johnson, R. M.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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28
Johnson, W. B.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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32
Johnson, W. R.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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33
Johnson, W. S.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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34
Johnson, W. W.
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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35
Johnson, William
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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36
Johnson, William
Confederate
Artillery
1st Regiment, Texas Heavy Artillery
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Patti, prochette@Juno.com