In Irish history the term "The Wild Geese" refers to these.
Irish who fought for England
Irish who immigrated to America
Irish serving with the UN in the Congo
Irish mercenaries in Europe
Irish who fought as mercenaries in Europe. After the Williamite War ended in 1691 over 14,000 Irish soldiers fled to France to fight as mercenaries. From 1691 to 1745, when it was made illegal, several hundred thousand Irishmen fought in European armies.