Do you know how many we're dedicated to the coasts?
I've got the numbers for early 1862 somewhere, though they're just in terms of regiments - I was working out how many could be reallocated in the event of a Trent War.
After the first phase of reallocation there were:
Texas:
3 TX, 8 TX, 12 TX
New Orleans:
3 MS, 21 LA, 22 LA, 23 LA
Pensacola:
1 FL, 8 MS, 27 MS
Savannah/Georgia coast:
1 GA, 29 GA, 30 GA, 32 GA, 34 GA, 52 GA
Charleston:
Gist (46 GA, 8 GA Bn, 24 SC)
Port Royal:
11 SC, 15 SC, 18 SC
Wilmington/Fort Fisher:
11 NC, 20 NC, 30 NC
Plus (not infantry): 36 NN/2nd NC Arty
New Bern:
27 NC, 42 NC, 43 NC
Plus (not infantry) 19 NC/2nd NC Cav, 40 NC/3rd NC Arty, 41 NC/3rd NC Cav
Roanoke Inlet:
8 NC, 17 NC, 31 NC
Plus (not infantry) 9 NC/1st Cav, 10 NC/1st Art
Norfolk:
Blanchard (1 LA, 3 GA, 4 GA, 22 GA)
Yorktown:
Pryor (8 AL, 14 AL, 14 LA)
plus 32 VA at Williamsburg, 34 VA at Gloucester Point
Now, the troops reallocated away were:
Army of the Peninsula: brigades of Rains, McLaws and Cobb (total 14)
At Norfolk: brigades of Colston, Mahone and Armistead (total 12, including 3 AL)
North Carolina can produce a full division:
brigades of Wise, JR Anderson and Branch (total 14, including 45 GA, 7 NC)
And can combine Ransom's brigade with two more from SC/Georgia:
brigades of Ransom, Gregg and Lawton (total 14, including 24 NC, 1 SC Provisional Army, 13 GA)
Leave Gist's brigade at Charleston and it can produce
brigades of Evans, Drayton and Mercer (3+4+4, total 11).
So that sums to 65 allocated away and 40 still in place. Call it 100 regiments, allowing for some of those to be battalions.
So about... 20%-25% of the total Confederate army, though much of that then historically did go to the main armies.
One analysis I saw suggested that the total strength (sans militia) along the Confederate coastline in early 1862 was:
2500 in Texas
7000 in Louisiana (facing 2000 Federals)
12000 in Alabama and Florida
22000 in Georgia and South Carolina (facing 16000 Federals)
12000 in NC
And 31000 around Norfolk and Yorktown (facing 12000 Federals)