More than 100 troops will touch down on Australian soil as part of New Zealand's largest firefighting deployment.A total of 50 personnel flew out of Ōhakea air base on Wednesday to join the battle against Australia's most brutal fire season in history.Twenty people have been confirmed dead as a result of the fires, and more than an estimated 800 million animals are believed to have died in the blazes. At least 8.4 million hectares of land has scorched and more than 1400 homes have been destroyed