original: oliver cromwell attacked drogheda in 1649 slaughtering the royalist garrison -lrb- siege of drogheda -rrb- .
simplifications: oliver cromwell attacked drogheda in 1649 killing the royalist garrison -lrb- siege of drogheda -rrb- . oliver cromwell attacked drogheda in 1649 killing the royalist garrison . oliver cromwell attacked drogheda during the siege of drogheda in 1649 . oliver cromwell attacked drogheda in 1649 slaughtering the royalist garrison . in 1649 , oliver cromwell attacked drogheda , killing the royalist garrison . oliver cromwell slaughtered the royalist garrison in 1649 oliver cromwell slaughtered the royalist garrison in 1649 , refered to as the siege of drogheda . known as the siege of drogheda , oliver cromwell attacked drogheda and slaughtered the royalist garrison in 1649 .