From 1825 to 1828, the number of Aboriginal attacks on colonists and their property more than doubled each year. Clements states that although the colonists knew they were fighting a war, "this was not a conventional war, and the enemy could not be combated by conventional means. The blacks were not one people, but rather a number of disparate tribes. They had no home base and no recognisable command structure."
George Arthur, governor of the colony since May 1824, had issued a proclamation on his arrival that placed Aboriginal people under the protection of British law and threatened prosecution for anyone who murdered them. Two Aboriginal men were hanged in September 1826 for the murder of three colonists and Arthur hoped that this would deter further attacks on colonists. But between September and November 1826 six more colonists were murdered, taking the number of colonists killed in the conflict to 36 since 1823. The
Colonial Times newspaper advocated the removal of all Aboriginal people from the settled districts to an island in the
Bass Strait, warning: "if not, they will be hunted down like wild beasts, and destroyed!" On 29 November 1826, Arthur issued a notice authorising settlers to treat hostile Aboriginal groups as open enemies and to use arms to force them from the settled districts. He also deployed additional soldiers and police to these areas. The
Colonial Times saw this as a declaration of war on Aboriginal people in the settled districts. Historian Lyndall Ryan argues that Arthur intended to force the surrender of the hostile Aboriginal tribes. Clements states that the November proclamation failed to clarify when it was legal for settlers to kill Aboriginal people. Over the summer of 1826–27, warriors from the Big River, Oyster Bay and North Midlands nations killed a number of stock-keepers on farms. The colonists responded with reprisal raids, in which many Aboriginal people were killed. On 8 December 1826, a group led by
Kikatapula threatened a farm overseer at Bank Hill farm at Orielton, near
Richmond; the following day soldiers from the
40th Regiment killed 14 Oyster Bay people and captured another nine, including Kikatapula. In April 1827, two shepherds were killed at a farm at Mount Augusta, south of Launceston, and a pursuit party launched a reprisal attack at dawn on an Aboriginal camp, killing up to 40 Aboriginal men, women and children. In May 1827, a group of Oyster Bay Aboriginal people killed a stock-keeper at Great Swanport near
Swansea. A pursuit party of soldiers, police and civilians later attacked an Aboriginal camp killing at least six people. In June 1827, at least 80 to 100 members of the Pallittorre clan from the North nation were killed in reprisals for the killing of three stockmen. From December 1826 to July 1827, at least 140 Aboriginal people were killed,
Martial law (November 1828) 's
Proclamation" painted in Van Diemen's Land about 1830, in the time of Governor Arthur. Nailed to trees, proclamation boards were designed to show Aboriginal people the benefits of living in peace with colonists under an idealised equal British justice.Violence escalated from August to October 1828, with the Oyster Bay, Big River, Ben Lomond and Northern peoples launching raids on stock huts during which 15 colonists were killed in 39 attacks. From early October, Oyster Bay warriors also began killing white women and children. On 1 November, Arthur declared
martial law against the Aboriginal people in the settled districts, who were now "open enemies of the King". Arthur's move was effectively a declaration of war. Soldiers were authorised to arrest any Aboriginal person in the settled districts without warrant and to shoot those who resisted. However, the proclamation also stated: Martial law would remain in force for more than three years, the longest period in Australian history. The predominant mood among colonists on the frontier was fear and panic mixed with anger and a desire for revenge. Although by the end of 1829 the number of Aboriginal people in the war zone had greatly diminished, this was not widely known and the threat that the remaining hostile Aboriginal groups posed to frontier farms was real. In November 1829, Arthur established an Aborigines Committee to inquire into the causes of the Aboriginal violence and make policy recommendations. The following February, he introduced a bounty of £5 for every captured Aboriginal adult and £2 for each child. He also sought the help of other colonies in increasing the military presence in Van Diemen's Land but without success. Among submissions it received were suggestions to set up decoy huts containing poisoned flour and sugar, that Aboriginal people be rooted out with bloodhounds and that
Māori warriors be brought to Tasmania to capture the Aboriginal people for removal to
New Zealand as slaves. Settlers and soldiers gave evidence of killings and atrocities on both sides, but the committee was also told that despite the attacks, some settlers believed very few Aboriginal people now remained in the settled districts. In its report, published in March 1830, the committee stated that the Aboriginal people had lost their sense of superiority of white men, no longer feared British guns, and were now on a systematic plan of attacking the colonists and their possessions. The committee's report supported the bounty system, recommended more mounted police, and urged settlers to remain well armed and alert. Arthur forwarded their report to
Secretary of State for War and the Colonies Sir
George Murray, blaming convicts for mistreating the Aboriginal people but adding, "it is increasingly apparent the Aboriginal natives of this colony are, and have ever been, a most treacherous race; and that the kindness and humanity which they have always experienced from the free settlers has not tended to civilize them to any degree." In response, Arthur extended martial law to the whole of Van Diemen's Land on 1 October. He also ordered every able-bodied male colonist to assemble on 7 October at one of seven designated places to join a massive drive to sweep the hostile Aboriginal people from the settled districts in a military campaign which became known as the Black Line. On 21 August 1829, four company servants killed an Aboriginal woman at Emu Bay, near present-day
Burnie. An investigation was launched but no one was prosecuted. Three company men were fatally speared in July and October 1831 and there were heavy losses inflicted on sheep and oxen. There were 16 recorded acts of violence against Aboriginal people in the conflict, but the number of Aboriginal deaths is unknown. Company employees stated that they believed killing Aboriginal people was justified to protect livestock. The population of the northwestern clans fell from an estimated 400-700 at the time of colonisation to about 100 by 1835. The population of the neighbouring northern Aboriginal people fell from 400 in 1826 to fewer than 60 by mid-1830. Violence in the northwest ceased in 1834 but resumed between September 1839 and February 1842 when Aboriginal people made at least 18 attacks on company men and property.
Military strategy and tactics Aboriginal warriors conducted a guerrilla war against the British. They mostly used three weapons: spears, rocks and
waddies. They almost always attacked during the day in war parties of 10 to 20 men. Although they favoured ambushes and hit-and-run raids against isolated shepherds and settler huts, sieges of huts for up to a day were not uncommon. Warriors often lit fires or used women to lure colonists out of their huts and into an ambush. They quickly learned that
muskets could only be fired about once every 30 seconds, so they often encouraged colonists to fire then closed in for an attack. War parties would sometimes divide into separate diversionary and main attack groups and then disperse after an attack to make pursuit more difficult. Attacks on livestock and arson of buildings and crops were also common but were not used systematically as a major war strategy. The main British military response involved official pursuit parties and roving parties. Pursuit parties mostly consisted of soldiers and convicts whose task was to track down Aboriginal groups presumed to be responsible for a particular attack. They were usually in the field for 12 to 48 hours. Roving parties were groups of soldiers, convicts and authorised civilians who patrolled the frontier for 12 to 18 days at a time with the aim of dispersing hostile Aboriginal groups. The main tactic of the official parties was to attack at night after campfires had revealed the position of the Aboriginal groups. Although their instructions were to capture hostile Aboriginal people where possible, in practice a successful ambush of a campsite almost always led to lethal violence. The main weapons used in ambushes were the
Brown Bess musket, bayonets and clubs. Vigilante groups mainly consisted of convicts but settlers and their employees were often involved. They generally used the same weapons and tactics as the official parties but probably inflicted more deaths on Aboriginal groups. == Black Line, October–November 1830 ==