SquireNed, I'd take a look at the map and see where the most important agricultural areas are for your target nation and then check to see where their water comes from. If it's a dam or a canal system, I'd make that the target rather than the farms specifically because for example, one dam might be providing water for hundreds of farms.
This way you hit almost all of them rather than specific clumps and you have the potential benefit (in terms of disruption) of flooding and maybe even destruction of hydro-electric powerplants.
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