I remain not entirely convinced
.
Same with me.
In the middle of the right hand column p.58:
" Otherwise if shock troops would normally be required to test to prevent them from charging with out orders,the following rules apply if they could not contact the enemy with out passing through friends,
even by wheeling and/or
dropping bases back".
for me that implies that they do drop bases back to make contact in the charge, but if they can't get in by contracting a base width they burst through the friendly BG.
I can't see where the rules distinguish between a voluntary and a compulsory charge in this case.