The Battle of Oulart Hill takes place in Wexford, Ireland; Irish rebel leaders defeat and kill a detachment of militia.

The Battle of Oulart Hill took place on 27 May 1798 when a rebel gathering of between 4,000 and 5,000 annihilated a detachment of 110 militia sent from Wexford town to stamp out the spreading rebellion in County Wexford.

Wexford is the county town of County Wexford, Ireland. Wexford lies on the south side of Wexford Harbour, the estuary of the River Slaney near the southeastern corner of the island of Ireland. The town is linked to Dublin by the M11/N11 National Primary Route; and to Rosslare Europort, Cork and Waterford by the N25. The national rail network connects it to Dublin and Rosslare Europort. It had a population of 21,524 according to the 2022 census.

May 27 is the 147th day of the year in the Gregorian calendar; 218 days remain until the end of the year.