Yes, it is possible to negotiate multiple times against the same unit.
It creates some tense die rolls, but usually the odds are against the negotiator. And a wise defender can usually stack enough units to make the negotiation impossible or meaningless.
yes but I think that logic must suggests that a castle that refuse a negotiation can't change idea
in this way a failed negotiation can slows the unbalancing "borg" effect of multiple succesfull negotiations and there is issue that Oda stacks can grows with betrayer units and regroup box becomes empty for faction under negotiation too ( for example Takeda ).
and I ask if its possible that Oda player can negotiate and adsorb Nagashino,Futamata and Kakegawa without the chance to have 2 of 3 change side to anti oda as Bessho and Hatano neutral clans.
Oda player can gain 3 further units without risk.
I not like the combo negotiation + attack on same space because castles with daimyo or samurai becomes too easy to take.