Political map of Australia, New Zealand & the Southwest Pacific 1 September 1855 (Tongan Intervention in Fiji): In the early 1840s war broke out in Fiji between Cakobau (Seru Epenisa Cakobau), the paramount Fijian chief (Tui Viti) and ruler of Bau (Vunivalu of Bau), and a coalition led by the Confederation of Rewa. After Rewa badly defeated Bau at Kaba in 1853, Cakobau converted to Christianity and requested the aid of George Tupou (George Tupou I), the Christian ruler of Tonga. The Tongans arrived in 1855, easily capturing Kaba and forcing Rewa to submit to Cakobau (Battle of Kaba).