The rules state on P. 85 when a 2 or 3 base TUC break.
Yesterday we played the Norman list of 1066.
It is in the file "MeG-Sample-Pacto-Armies-2024-01.pdf" on Page 21.
The 1st Unit "Familia regis" consists of only 1 base.
When does a 1 Base TUC break?