After the trial and execution of Charles I in January 1649, the Rump Parliament passed an on 19 May 1649. The monarchy and the House of Lords were abolished, and so the House of Commons became a unitary legislative chamber with a new body, the Council of State becoming the executive. However the Army remained the dominant institution in the new republic and the most prominent general was Oliver Cromwell. The Commonwealth fought wars in Ireland and Scotland which were subdued and placed under Commonwealth military occupation.