The Battle of Moyry Pass was fought during September and October 1600 in counties Armagh and Louth, in the north of Ireland, during the Nine Years' War. It was the first significant engagement of forces following the cessation of arms agreed in the previous year between the Irish leader Hugh O'Neill and the English Crown commander, the Earl of Essex.
The battle was fought by the armies of O'Neill and Lord Mountjoy, a follower of the late Earl of Essex. Mountjoy was determined to pierce O'Neill's heartland in central and western Ulster by the Moyry Pass. In the course of a two-week assault the English troops established a garrison near Armagh, taking heavy casualties, and Mountjoy retired with difficulty to Dundalk.
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