So the Etruscan infantry 1st,2nd and 3rd class may combine in a TUG 3 rank deep at the deployment. ( special rule )
Minimum is 16 bases ( 8 + 8 )
Nw to be perfectly clear the 3 rank mandatory "deployment" may be ignored later during movement and melee so second and/or 3rd rank can deploy and enlarge the TUGs front, the 3 rank deep formation being mandatory only at deployment . not during movements, charges, pursuit and end of contact with the enemy . Correct ?