Rules for Barbarian Army Structure

Caesar 3 organizes attacking forces in groups of 16.  This gives nice blocks of 4×4 or 2×8 when attacking in open country.  If the number of attackers specified allows the type 1 barbarian to exceed 16, a sub group of stragglers is formed to make up the total. 

Caesar 3 allows only 120 attacking solders in one invasion (multiple invasions in the same year however ).

Caesar 3 only allows 3 armies of each type of solder.  If you do the math you will see that (3 x 16) x 2 types is 96 solders.  What happens to the other 24 solders?  When your invading force gets bigger than 3 x 16 solder armies, tightly packed sub groups are added inside the larger first three army blocks (Max Pack).  These concentrated interior forces move independently, and can have horrific effects on Caesars Legions!

A 120 man invasion of Etruscans. The two types of units are clearly visible in their three, 2×8 armies. The Max Pac units are marked with red arrows.