Big Tim: You'll find a full account in the book "Towards Ireland Free" by Liam Deasy. It was published by the Mercier Press in 1973. Very briefly an ambush was set up at Upton Station on February 1921 for the Cork to Bantry train which the First Cork Brigade had information would only contain about twelve to fifteen British soldiers> However at the Kinsale Junction of the line another fifty soldiers joined the train and of course when the asault began the attackers were vastly outnumbered.