Kammala jumla mai zuwa: Hagnon ya jagoranci rundunar soji na Athens a lokuta da dama, yana cikin jagorancin sojojin da suka tashi a kan Samos a cikin
Yaƙin Samian na 440 kafin haihuwar Yesu kuma yana jagorantar rundunar da ta yi ƙoƙarin kama Potidaea a 430 kafin haihuwar Yesu. A cikin 421 BC, yana ɗaya daga cikin 'yan Athens da suka sanya hannu kan Zaman Lafiya na Nicias, yarjejeniyar, wanda wani janar na Athens ya yi shawarwari tare da suna iri ɗaya da mahaifinsa (babu dangi), wanda ya kawo ƙarshen abin da ake kira Archidamian War, mataki na farko na Yaƙin Peloponnesian; ya kuma sanya hannu kan kawancen tsakanin Athens da Sparta wanda aka kammala a wannan shekarar.