I'll answer the questions that I can.<br/><br/>The Civil War could have started a few years after Mei stepped down as the Fifth(?) Mizukage.<br/><br/>The swords that could be on the War side can be: Zabuza's sword Kubikiribōchō, Nuibari and Shibuki.<br/><br/>The sword that is still undecided could be: Kabutowari<br/><br/>So the others could be on the Peaceful side.<br/><br/>I feel like something should segue into helping with the war. Probably an ambush from Mist ninja that are sided with the Bloody Mist side. We could differentiate between the two sides like: White Mist and Bloody Mist, peace and violent, respectively.<br/><br/>This thing is going to be large scale so we might need some help from the other Task Forces, or we can come up with a sure way to stop the war, like killing the leader of the Bloody Mist.<br/><br/>I think if there is a Tailed Beast NPC it should be on the Bloody Mist side, probably Itobu, the one eyed turtle with the Water Jutsu.