The War Against the Fallen was the portion of Shan-wei's War falling between the destruction of the Alexandria Enclave and the final reconsolidation of the Church of God's authority.

The Church itself remembered it as an epic struggle between the Archangels and the followers of the Fallen Angel Kau-yung, Shan-wei's chief lieutenant. (MTAT)

Merlin Athrawes eventually discovered that the so-called "War Against the Fallen" was actually a prolonged conflict between Maruyama Chihiro's followers and the surviving Operation Ark military personnel. The original seijins were created by re-educating a number of Adams and Eves to serve as government agents with special abilities and Federation equipment. (HFQ)