In contrast to later practice, during the Revolution the armed services were largely integrated with only a few segregated units. While the vast majority of Afro-American troops fighting in the Revolutionary War will always remain anonymous, there were several who achieved distinction and made their mark in history. Both Prince Whipple and Oliver Cromwell crossed the Delaware with Washington on Christmas Day in 1776. Lemuel Haynes, later a pastor of a white church, served at the Battle of Ticonderoga. According to many reports, Peter Salem killed the British major, John Pitcairn, at the Battle of Bunker Hill. Gradually, the colonies were split into two sections by differing attitudes towards slavery. In 1780 the Pennsylvania Legislature passed a law providing for the gradual abolition of slavery. The Preamble to the legislation argued that, considering that America had gone to war for its own freedom, it should share that blessing with those who were being subjected to a similar state of bondage in its midst. Three years later the Massachusetts Supreme Court decided that slavery was contrary to that state's constitution and that it violated the natural rights of man. Connecticut, Rhode Island, New Jersey, and New York all passed laws providing for gradual emancipation. Although the liberal philosophy of the revolution did lead these states to end slavery, most Northern citizens were not genuinely convinced that natural law had conferred full equality on their Afro-American neighbors. Racial discrimination remained widespread. At the same time, the Southern states which were dependent on slavery for their economic prosperity showed little interest in applying the doctrines of the Declaration of Independence to either the slaves or the free blacks in their midst. If anything, the passage of stiffer black codes increased the rights of the masters while diminishing those of slaves and freedmen. Some Southern states had qualms about the advisability of continuing the slave trade, but this did not mean that they had doubts about the value of slavery. Rather, the number of slave insurrections which swept through South America, highlighted by the bloody revolt in Haiti, led them to fear possible uprisings at home. They had always been cautious about bringing unbroken slaves directly from Africa, and now they were also afraid to import unruly slaves from South America.