If you read the top of page 11 you will see there is a new rule for V3 where you cannot combat move through a canal as you proposed. The example they give is exactly what you were talking about. You can still choose to do it the old way but either way that is one of the things you should have all of the players to agree to before the game begins. We always play it the new way.
Forts/Bases - Declare location when beginning construction?
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Does one have to declare where the fort will be placed at the beginning of construction? Same question for bases.
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@sjelso Yes, see page 26 under Facilities.
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That way, all facilites under constuction are subject to strategic bombing or capture.
There is also an optional rule (15.8) to declare multi-stage ships under construction. It’s more realistic that way.