Wasn't Bordeaux taken by Castille? Btw spreading plague is forbidden with spies.
If he did with armies, that's not an issue of the rules.
In any case England/HRE has nothing to do with it (at least this turn)
Also contact @Myth
@Gaius Octavius Caesar / @Lord Luka : can you make a quick check? Load your last turn and click on Rennes and Bordeaux. If they had plague already on your turn, then it spread naturally. When plague spread naturally usually it spread at the end of the player's turn (in this case France turn 52).
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