Doing some OOB research. >>/36415/ lists the 2nd Infantry as having two battalions but elsewhere mentions it only had one. I looked up the source (Army Reserved Bulletin 11-C, 1970) in the National Archives and indeed it's only one. But there's more, it breaks down to the company level. For instance, the Infantry-School Regiment had: Commander & staff Command company Services company Hvy mortar company Tank company x2 Infantry battalion Commander & staff Command company x3 Fusilier company Hvy weapons company Most others have no heavy mortars and merge command and services companies. The number of fusilier companies per battalion varies, two-battalion regiments often have two-fusilier battalions, so those are a better yardstick for comparison. The Tiradentes Detachment had 8 (Army) and 6 (Police). 1st Caçadores: 2, possibly only one at the frontline. 1st Infantry: 2 assuming one battalion stayed in quarters. 2nd Infantry: 3. The engineer company following would also man the frontline. 3rd Infantry: 4, but how many in theather? At the very least one battalion was on its way. Nonetheless sources still state Cunha Melo had the numerical advantage over Muricy. AMAN Cadet Corps: 1-1,5. AMAN Command and Service Battalion: 1 (guards). 1st Armored Infantry: 2. 5th Infantry: 3. 6th Infantry: 3. 4th Infantry: 4. 1st Light Tank Battalion: 2. 4th Caçadores: 2. 17th Cavalry: 2.