In one incident, Laurence Esmonde, Lord Esmonde, the Royalist commander hung 16 Irish prisoners who had been taken at nearby Ramsgrange.
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O'Byrne however was undeterred, addressing a flood of petitions to the English Crown, accusing Esmonde and the Lord Deputy of Ireland, Lord Falkland, of conspiracy and perjury.
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In 1639 he was summoned before the Star Chamber for having conspired with Lord Mountnorris and Sir Piers Crosby to libel the Lord Deputy Strafford in the matter of one Robert Esmonde, a relative of Lord Esmonde, whose death Strafford was accused of causing by ill-treatment while he was being questioned about customs evasions.
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In 1599 he was appointed to the command of 150 foot, and was actively engaged during the rebellion of Hugh O'Neill; and it appears from a letter of his to Lord Shrewsbury that he even endeavoured to procure the assassination or banishment of O'Neill but in this he was unsuccessful.