But putting my romans in turtle formations , archers become useless a bit ...... great customs, greaaaaaaaaaat customs WoT !!!!!
Actually (if we play by my
Melee Combat Rules )
Then it is only a matter of tactics to stop your turtle formation.
Sorry, just realized but that link will not give you the whole rule book...
I haven't uploaded it all.

But there is a second part to the rules that explains special formations like the turtle formation.
Here are the rules for the Roman Tortise:
Roman Testudo: When Legionnaires form the testudo (tortoise) position. The formation can suffer no casualties from arrows if the archer is facing the formation. The individual legionnaires also gain +1 defending die. However, the unit’s flanking area is expanded and an attack to their flanks can occur if the attacking unit is past 45 degrees to either side of the legionnaires facing position.
When we have our battle I can explain that in a little more detail,
And hopefully make it sound clearer.