At the Battle of Yamazaki on June 13, 1582, Hideyoshi set up his headquarters at Hoshakuji on the slopes of Mt. Tennozan, using the high ground advantage to defeat Akechi Mitsuhide's forces. This battle gave rise to the phrase 'Tennozan,' meaning a decisive moment, and just 13 days after the Honno-ji Incident, Hideyoshi's victory here set him on the path to ruling Japan.