Originally Posted by
GooseFraba
How do I rearrange my war base?
During preparation day, your war base will automatically rearrange to match your village layout. If you want to rearrange your war base, just rearrange your regular village. Be aware that your war base can not be rearranged after preparation day has ended,
EDIT : It means that during first day of clan wars, there will be a timer. If u rearrange your base when there is just 1 hour left, that will work out better. When the timer hits 0, that's when they take the 'snapshot'