Interpenetration: Longbowmen/Dismounted Knights or Billmen

[Montesa]

I have a Hundred Years War English Army. I have played some games and adapting the list to be the more versatile that I can find with my manner to play the game, having some defeats (very narrow to win all the times).
But I want to find the best use of my army with the rules and I have a doubt.
If I have a BG of English longbowmen and its rear it has Billmen. And in the army list says I can do interpenetration between these troops. From the back to front or from the front to back.
So my question is the following: If I want to move the LB from the front to the back of the billmen, must I do a CMT to turn 180º and do an advance or by broken, or I can only “move” the LB behind the billmen without any CMT?
How is the best manner to exploit the use between Billmen and LB in a game?
thanks

[lawrenceg]

If I want to move the LB from the front to the back of the billmen, must I do a CMT to turn 180º and do an advance or by broken,

Not exactly, see the simple and complex moves table.
For drilled MF to turn 180 degrees is a simple move. Turn 180 degrees followed by an advance is impossible.

So you turn 180 with no CMT for one move. Then you advance with no CMT for the second move.

or I can only “move” the LB behind the billmen without any CMT?

no, you are allowed to interpenetrate in the course of normal movement. It does not add a new special manoeuvre.

How is the best manner to exploit the use between Billmen and LB in a game?
thanks

Probably better to move the billmen forward through the bowmen.

[rbodleyscott]

How is the best manner to exploit the use between Billmen and LB in a game?
thanks

Probably better to move the billmen forward through the bowmen.

Having used the army, and seen others do so, I wouldn't bother to try using the permitted interpenetration at all. The army works better with the BGs side by side. (Usually with men-at-arms in the centre and longbows on the wings, either locally or overall). This also seems to be the way they were more usually deployed historically. (Though the interpenetration thing allows for Towton, for example).

[Montesa]

Thanks for your help.
lawrenceg, you were right, and commit a great mistake about the 180º movement.
Only one question: can I do a 180º stationary movement with LB and interpenetrate with the HF?

As said rbodleyscott, I have ussually used the longbowmen as flanks of the HF. (the historical manner). but in the last game I tried the HF as rear of LB, and I think that against some type of troops will be useful (very few times) and more resistent against the failure of cohesion tests, but makes the army too nailed in two lines.