Australia after an round trip. Operation Rimau Operation Rimau—an attempt to repeat the success of Jaywick—was launched in October 1944, with Lyon commanding a 23-man Z Special Unit raiding team again on a mission to sink Japanese shipping in Singapore Harbour. The party captured a Chinese junk and sailed towards Singapore, but were forced to abandon ship when they destroyed a Kempei Tei patrol boat that had approached them. Ordering his men to retreat back to Merapas island and await submarine rescue, Lyon and five others attempted a reduced-capacity raid on Singapore Harbour, destroying three ships. After a four-month series of island hops and often ferocious battles with large numbers of Japanese forces, the entire 'Rimau' party were either killed during combat (Lyon was the first of these), drowned or captured. Those captured were executed by beheading after a sham trial shortly before the Japanese surrender. Lyon died on the tiny island of Soreh on 16 October 1944, whilst fighting a rearguard action to assist the getaway of two injured members of the 'Rimau' party. Discovered by a Japanese landing crew, Lyon—together with Corporal Clair Stewart and Lieutenant Robert 'Bobby' Ross, and the injured Private Archie Campbell and Lieutenant-Commander Donald Davidson—engaged the Japanese in battle, killing and injuring seven. The remaining Japanese escaped. Knowing that the Japanese would come back in a matter of hours with reinforcements—and that there was no possibility of island-hopping to safety with two injured and exhausted comrades—Lyon made the decision to dose the injured Davidson and Campbell with morphine, and set them on their way towards the nearby island of Tapai, where other members of the Rimau party were known to be holed up. Lyon set about creating rudimentary defenses, taking into account the position of a Malay household. The danger of accidentally involving the occupants of the shack in the forthcoming battle led Lyon to switch the position of his defenses away from this location, a formidable task given that the tiny island was bereft of significant cover, and almost entirely indefensible in the daylight. Lyon and Ross climbed a large Ru tree, having first equipped themselves with a massive amount of magazines and grenades. Corporal Stewart was positioned in a stone-lined ditch, about to their left, together with a cache of grenades and ammunition for the Silent Stens that all three carried. The Japanese returned two hours later, consisting of approximately 110 soldiers.