With the help of Gerald FitzGerald, 8th Earl of Kildare and his brother Thomas FitzGerald of Laccagh, Lord Chancellor of Ireland, Lincoln recruited 4,500 Irish mercenaries, mostly Kerns, lightly armoured but highly mobile infantry.
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With his army swelled by Irish recruits led by FitzGerld's brother Thomas FitzGerald of Laccagh, Lincoln landed at Piel Island in Lancashire and proceeded to march towards York, formerly a stronghold of Richard III's supporters.