Help - retreating from naval battle

[unmerged(200898)]

I've been working through the excellent 'How The Heck Do You Play This Game AAR' and have run into real problems with my sub fleets. I understand it should be possible to break off a sea battle after 4 hours of contact, but I can find no way to do it, in the battle or the unit dialogs. Can anyone tell me what I need to do to stop a Wolfpack of 18 subs being sunk by a carrier task force!

Thanks in advance
John

 

[unmerged(200898)]

ok, answering my own post...just click the province you want to retreat to ;-)