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All other A&A games I own, the xport can at least defend with a roll of 1.
Yes, this has changed starting from Anniversary Edition.
If a transport is attacked in one sea zone, are other ships allowed to use that same sea zone to attack another enemy ship(s) in another sea zone? Eg japan having ships in malaysia. British has a DD in the sea zone next to Burma, a transport in the sz of Sumatra, and the main fleet next to India. Can japan use one ship to sink the transport and the rest of the ships move through Sumatra to attack the Indian fleet?
Transports and subs never block movement, even when being attacked.