Although Napoleon's army entered Russia with far more supplies than in their previous campaigns, it had provisions for only twenty-four days.
the preposition for is more precise than in because supplies are gathered for an upcoming campaign
If than is followed by a clause referring to army, the subject of that clause must be singular (it).the preposition for is more precise than in because supplies are gathered for an upcoming campaign, D uses the imprecise in and the plural their.
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