When you draw a chit, You may move your blocks, keeping the same facing (following orders). If you want to change facing (issue new orders), the HQ must flip to spent. When you are done moving the first block, its new facing indicates the new orders, and any block you move after that must end with the same facing.
You may refuse the flanks at the ends of your line.
When you attack, your block must be following orders (facing the right way) when it contacts the defending block, then you may have to adjust it to conform to the defender’s facing. You must always conform to defenders facing, and this facing change is free.
Your blocks in Road Column follow roads. Entering or leaving a road counts as changing the command’s facing, and requires issuing new orders.
You may rotate artillery to fire without changing orders.
Overlapping
A block in end to end contact with a block in combat gives that block advantage if it is not in contact with an enemy block.
Two such blocks grant an additional advantage.
In the event a block has two, or more, favorable advantages than the defender, the defender uses a disadvantaged die and the attacker uses the advantaged die.
Here is a link to my video explaining the rules:
Boom Simple Musket Battles 