The anti-Treaty IRA under Liam Lynch tried to use the same guerrilla tactics against the Free State as they had against the British in 1919–1921. However, without the same degree of popular support, they were less effective. By late 1922, the Irish National Army had taken all the major towns in the country and reduced the IRA's campaign to small scale attacks. A very large number of anti-Treaty fighters, some 12,000 in all, were interned by the Free State. Moreover, as it went on the war produced acts of great cruelty on both sides. The Free State embarked on a policy of selective executions – 77 prisoners were judicially shot with over 100 more 'unofficially' killed in the field. The anti-Treaty forces assassinated one pro-Treaty member of Parliament, and several other civilian politicians, wounded more and burned their houses. However the Free State's tactics of internment and executions combined to cripple the anti-Treaty forces by April 1923.