Drogheda or \/ Ë drÉ '' Ë dÉ \/ ) ( Droichead Ã tha in Irish , meaning `` Bridge of the Ford '' ) is an industrial and port town in County Louth on the east coast of Ireland , 56 km ( 35 mi ) north of Dublin . Drogheda is an industrial and port town in County Louth on the east coast of Ireland , 56 km ( 35 mi ) north of Dublin .