[Taqwus]

Seawolf --

You should be able to just move the sweeper there, into the field. The explicit sweep command seems to be there in case you're already at the field (which shouldn't happen unless you encountered a minelayer, which then laid the mines right around your ships -- e.g. if you attack one, it panics, and drops a trail of mines while fleeing that you don't manage to entirely wipe out during the 30 turns).

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-- The thing that goes bump in the night