Washington, November 26, 1861
Andrew, John -
Addendum to T-180 (cavalry doctrine)
Returning to secure bases:
Cavalry regiments returning to previously secured bases for rest should be ordered to immediately set up camp within town limits. This will enable them to return to active operations faster. If enemy forces are threatening the area, then the situation should be discussed with HQ.
Addenda to T-188 (joining amphibious forces)
Item 2. Abandoning trenches
Troops that completely abandon entrenched positions in or around depots close to the front line, the rail areas west of the capital, or any of cities mention in T-18 which come into our possession (whether they have depots or not), without prior authorization, will not be subject to joining amphibious forces. They will be required to rebuild those positions, while other troops from the same theater are selected to join the amphibious forces in their stead. I repeat this includes trenches in the cities and forts, and in the surrounding regions. Most of these locations will need to be defended inside and out. I repeat the President's directive from T-18 that at least one regular brigade, even if it only contains a single regiment, will be stationed at any of these points that come into our possession.
I have included the relevent list of cities from T-18:
Fort Sumter, SC
Fort Monroe, VA
Little Rock, AR
Bowling Greene, KY
Baton Rouge, LA
New Orleans, LA
Saint Louis, MO
Item 3. Extraneous troops
The definition of extraneous troops is expanded to include any regiments or brigades far from the front that are not being used to relieve other troops, or otherwise moving into position to be of service.