In 1649, after the proclamation of the republican Commonwealth, Cromwell led a punitive expedition into Ireland, especially remembered for the massacre of the royalist garrison at Drogheda. He then initiated a policy of systematic dispossession of the Irish, transferring their lands to Protestant proprietors. In 1650 he invaded Scotland and routed the Scottish royalists at Dunbar; later he defeated the Scots and Charles II himself at Worcester (1651) and left the rest of the conquest of Scotland to Gen. George Monck.
Cromwell, now virtual dictator of the Commonwealth, dissolved the Rump Parliament in 1653 after it had failed to effect reforms demanded by the army and had sought to perpetuate its power. His attempt to replace it by the Nominated (Barebone's) Parliament (see Barebone, Praise-God), appointed by himself from nominations of the Independent congregations, resulted in a reckless, hopelessly divided body that was finally forced to dissolve itself. A group of army officers then drew up the constitutional document known as the Instrument of Government (1653), by which Cromwell became lord protector (see Protectorate). The Parliament of 1654, which was elected under the terms of the same document, wanted to prepare a new constitution and was soon dissolved.
After that Cromwell resorted to open military government, dividing England into 11 districts, each administered by a major-general. Another, more amenable Parliament was summoned in 1656, and in 1657 it presented to Cromwell a new constitution known as the Humble Petition and Advice and offered him the crown. He declined the crown but accepted (with some modifications) the Humble Petition, which further increased his power and set up a second legislative chamber. The second session of this same Parliament, however, challenged the new constitution, and Cromwell dissolved it (1658) seven months before his death.
Cromwell's foreign policy was governed by the need to expand English trade and prevent the restoration of the Stuarts, and by the desire to build up a Protestant league and enhance the prestige of the English republic. He approved the Navigation Act of 1651, which led to the first (1652–54) of the Dutch Wars, and he pressed the war against Spain (1655–58) as a means of encroaching on Spanish rights of colonization in America. The Dutch war resulted in several important naval victories for the English under Admiral Robert Blake, but the Spanish war, apart from the sinking of a Spanish fleet (also by Blake), brought only Jamaica and imposed a great strain on English finances.
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