You seem to be a guy with military know how. Is there any way you can get the Pakistan Army order of battle [orbat] for East Pakistan at the start of the war? And unit strengths etc
HQ Dhaka
-Engineer Brigade(3 Engineer Regiments)
-Light AD Regiment
-Signals Regiment
-Aviation Squadron
-SSG Battalion (under strength)
14 infantry Division. Deployed since independence for Defence of East Pakistan.
-202 Brigade (2 infantry battalions + 1 mujahid battalion)
-313 Brigade (2 infantry battalions + 1 vastly under strength mujahid battalion)
-27 Brigade (Hastily formed, 2 infantry battalions + 8 Light tanks)
-Artillery Brigade (1 medium Regiment + 2 mortar batteries)
9 Infantry Division. Airlifted to E.Pak in March 1971
-57 Brigade (3 Infantry Battalions + 12-15 Tanks)
-107 Brigade (4-6 Infantry Battalions)
-Artillery Brigade (2 Field artillery Regiments + 1 Mortar Battery)
-A tank Squadron
-3x Wings of paramilitary
16 Infantry Division. Airlifted to E.Pak in March 1971
-23 Brigade (4-6 Infantry Battalions)
-205 Brigade (3 Infantry Battalions)
-34 Brigade (2 Infantry Battalions)
-Artillery Brigade (2 Field regiments + 1 Mortar Battery)
-2x Tank Squadrons
36 AdHoc DIV
- 2 Infantry battalions + 2 paramilitary wings + mortar battery
39 AdHoc DIV
-117 Brigade (3 Infantry battalions)
-52 Brigade (3 Infantry battalions)
-91 Ad Hoc Brigade (1 infantry battalion + 2 Paramilitary wings)
-1x Artillery Regiment
97 Independent Brigade
(1 Infantry Battalion + 1 understrength SSG Battalion + 2 paramilitary wings + AD battery)
Thats a total of 5 Infantry Divisions, all of which are under strength in artillery/armor/other support elements like AD, Engineers,Logistics etc and one division is just size of a brigade.
To uplift numbers, paramilitary wings and mujahid battalions were added which were again under strength. 5 of the 11 East bengal Infantry battalions mutinied while the rest became under strength due to desertions and all the E-B battalions almost became non-existent.