1. Army up to 1800

1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th Infantry Brigades@ 2 Regiments
Foreign Brigade: 1st, 2nd Foreign Regiments (Germans)
Illirrius Brigade: 1st, 2nd Regiments (Albanians)
5 Volunteer Light Infantry Regiments
4 Cavalry Brigades@ 2 Cavalry Regiments

2. Army of 1800-c1807

1st, 2nd, 3rd, 5th, 6th Infantry Brigades@ 2 Regiments
1 Albanian Chasseur Battalion (light infantry)
6 Provincial Light Infantry Regiments
6 Cavalry Regiments
# Provincial Infantry Regiments
# Provincial Cavalry Regiments

3. Army of 1808

5 Infantry Regiments@ Chasseur, Fusilier, Grenadier companies
2 Garrison Infantry Regiments
8 Sicilian Volunteer Garrison Infantry Regiments
4 Sicilian Volunteer Light Infantry Regiments
1 Sicilian Volunteer Artillery Regiment
1 Sicilian Volunteer Engineer Regiment
Royal Guard Grenadier Corps
Foot Artillery
3 Cavalry Regiments
1 Albanian Chasseur light infantry Battalion (up to 1812)
Marines in navy
British Garrison

4. Notes

a) 1808 infantry are British uniformed, and assumed to be British organised.
b) Some Sicilian Volunteer units were absorbed into regulars in 1812, including the Albanians.
c) The army was royalist, originally of the Kingdom of The Two Sicilies, being ousted from Naples c1806 and taking refuge in Sicily where it became a British allied force.