Confident that many magnates and even many of Richard's officers would join him, Henry set sail from Harfleur on 1 August 1485, with a force of exiles and French mercenaries.
Overbevist om, at mange stormænd og endda nogle af Richards embedsmænd ville slutte sig til ham, satte Henrik den 1. august 1485 sejl fra Harfleur med en styrke af landforviste og franske lejetropper.