Yes, if America decides to try and move through SZ 60 with those ships in the combat movement phase, they will have to stop and engage the defending enemies. However, if you clear them out and then try to move your ships through on non-combat they can sail through.
Sea zones 5 & 6 question
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how do you get between SZ5 & SZ6? can ships get through that tiny opening at the bottom of Norway and the top of Western Europe?
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Yes, the Strait of Denmark is open to shipping.
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one other quick question please… when a bomber or fighter attack a ship in the sea, do they get unlimited shots??
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Yes. Air attacks (other than SBRs) work in the same way as any other attack. The attack continues until one side or the other (or both) is destroyed, or the attacker retreats (or the defender submerges if it’s a sub).