In 1944 a special Japanese unit, the 'Matsu Kikan' ('Matsu' meaning Pine Tree) was tasked with gathering intelligence on bases and allied air activity in Northern Australia. Sailing from Timor in a disguised fishing vessel the 'Hiyoshi Maru', the team, all experienced in unconventional warfare, successfully made landfall in Western Australia and conducted a reconnaissance in the remote Kimberley region before returning to Koepang.