Awarded a large fief of 250,000 "koku" in Higo province, Katō ruthlessly suppressed Christianity. A follower of Nichiren Buddhism, he soon came into conflict with the lord of a neighboring province, a Christian named Konishi Yukinaga. In 1592, Kato Kiyomasa led part of Hideyoshi's army in his campaigns in Korea—alongside his rival, the "daimyō" Konishi. He occupied the city of Seoul and later crossed the Tumen River into China. Historian Stephen Turnbull describes the horror and destruction of the Korean Invasions in several of his books as seen through the eyes of the Priest Keinen who accompanied the samurai during the campaign. Keinen's diary "Korea Day by Day" was so controversial that it remained unpublished until 1965. Turnbull also described Kato Kiyomasa's motivation for attacking the Jurchens of Manchuria in 1592 was 'to show the savages the mettle of the Japanese'.