In prepared positions it was quite common to have both wire and minefields for local protection, these would not necessarily be continuous (circling your position with a ring of concertina wire is a bit of a giveaway) but somewhat irregular with gaps. Troops taking over the position woudl be extremly upset if the extent of the minefields weren't marked in some way, particularly if they are planning on advancing any time soon.
So, in a skirmish game it would not be unreasanable to have a platoon assault vs a section in a prepared position with both wire and fairly extensve minefields. To make a game of it, say half the defending sections front is covered by minefields with a depth of 30m or so. Traditionally the wire is closer to the defended locality than the mines.
summary from 'The Infantry Division in Battle' (1950):
minefields are four types:
tactical – channelling enemy forces in pre-palnned killing zones. These are likely to be both deep and wide.
defensive – laid between defended localties to prevent the enemy penetrating between them. Also likely to be fairly wide.
protective – strenghten defensive posts and protect the garrisons. These are the sort I'm talking about above.
nuisance – laid during a withdrawal in places the enemy must move. These are the sort most commonly seen in wrgames.
ALL forms of minefields with the exception of nuisance minefields must be charted and marked in some way. In the event of advance they may have to be removed in a hurry. Charts will be handed to relieving troops and if possible, the minefields shown to them personally.
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