The heiji war was a war between the chinese and japanese vietnam's war for independence from the chinese a war between the samurai and shogun a civil war between the taira and minamoto clans

The answer to your question is ... A civil war between the Taira and Minamoto clans.
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Assemblies do not have written codes of laws. laws are matters for magistrates and courts, not assemblies. codes of law are things such as civil law, criminal law, and constitutional law. what assemblies have are procedures regarding debating, voting and other business they might carry out.  also note that rome had three assemblies: the assembly of the soldiers, the assembly of the tribes, and the plebeian councils.