The "Mayflower" set sail for England on April 5, 1621, after being anchored for almost four months in Plymouth Harbor. Nearly half of the original 102 passengers had died during the first winter. As William Bradford wrote, "of these one hundred persons who came over in this first ship together, the greatest half died in the general mortality, and most of them in two or three months' time". Several of the graves on Cole's Hill were uncovered in 1855; their bodies were disinterred and moved to a site near Plymouth Rock.