In his military camp in Oyama-jo Castle in Shimotsuke Province, Ieyasu was informed by an envoy dispatched by Mototada in Fushimi-jo Castle that Mitsunari started moving his forces.
家康は下野国・小山城の陣において、伏見城の元忠が発した使者の報告により、三成の挙兵を知った。