From Athelny Alfred supposedly went into Danish camp as a harpist. Here, hiding incognito, he supposedly burnt the cakes. May 4th, Alfred has all men, who are done sowing, gather to him at Egbert's stone. They are glad to see him, as if he had risen from the dead. Remain overnight at Egbert's stone.
Speed is essential.
He probably sent out raiding parties to mask his movement. Alfred marches his troops to Iglea. Alfred meets the Danes at Ethandun. Alfred's forces lock their shields in a shield wall. Alfred wins the battle of Ethandun.