Slitherine

The unit being interpenatrated is artillery :

Can an infantry unit move trough an artillery unit AND while being in that unit, shift sideways and continue forward ( it had to shift while in the artillery or it would have been within 6 MU of the ennemy )?

Can a unit wheel and interpenetrate an artillery in order to charge trough the artillery at an angle so as to catch an enemy unit that is not really in front of the unit ( before wheeling ) and the artillery ?

And what if the unit is not artilery ?

As long as the requirements on page 40 are met the unit passing through the artillery (or any other unit type) can complete any permissible move, which includes sliding and wheeling.