The Oda clan was one of the three most powerful clans during the Sengoku era. It competed against many other clans surrounding the Oda's territory of Owari, and managed to expand it so far that it's leader, Oda Nobunaga is known to be one of the 3 great unifiers of Japan. The clan lost it's power mostly after the Battle of Honnō-ji in which the battle resulted the death of Oda Nobunaga. After the latter's death, the young Oda Hidenobu became the clan's new Daimyo till his death at the Battle of Sekigahara.
The Seven Spearmen of Azukizaka were seven notable generals who Oda Nobuhide considered to have performed greatly during the first Battle of Azukizaka.