http://archive.org/stream/manuscriptsof ... 3/mode/2up
This above link takes you to the Manuscripts of the Marques of Ormonde. Printed in 1895 it's open to suspision as to the accuracy, but that's perhaps true of all sources. Anyway...
Pages 120 to about 146 really caught my eye. (If using the slidy bar at the bottom, starts at page 132, which is equivalent to page 120 of the printed book).
It appears to list the entire English forces based in Ireland at that time.
Regiments, Colonels, Captains. The Lt Colonels and Sergent-Majors.
Also lists the total number of men in each company - starting around printed page 130.
Example from printed page 132 (Bottom of page 131 suggests this information is from 23 Dec 1641).
Munster:
In Lord Lt regiment
Captain George Monke, Lt Cnl - Present
Officers 9
Pikemen 44
Musketeers 125 = 145
Absent
Ensign, Sick,1
Soldiers, sick 16
In all 162
Captain Henry Warren, Sgt Maj - Present
Officers 10
Pikemen 42
Musketeers 92 = 144
Absent
Soldiers, sick 17
In all 110
So if anyone is planning an army at this time, I recon this is worth a gander for some inspiration.
I also note that many of the companies and regiments appear in England during the ECW. Obviosuly the numbers and names will change drastically, but a fair few of them appear to have common command structure in place.
In the example above, Monke took command of the Regiment in 1643, but when the Regiment was at Nantwich in 1643 it was lead by Warren (Monke at the time was persuading Charles he wasn't a rebel, but you all knew that anyway). Warren was the Lt Colonel of the regiment and wanted to hand command back to Monke. It is sugested that Monke refused and wanted to fight in the front rank with a pike.
Anyway, it would appear that this regiment would have been quite similar between Ireland and Nantwich, with officers moving through due to deaths of officers etc.
Also, if you're doing the English force in Ireland around 1640 and 1641, I think that if you haven't discovered this aready, it will hopefully be really useful for you.

