And another small point, while James himself left for a nice French holiday after the Boyne (he must have been quite stressed, the battle probably ruined his nails.....), the final defeat of the Jacobites by the Papal forces under William was a bit later, at Aughrim/Limerick in 1691 as formalised by the Treaty of Limerick. This was followed by "The Flight of the Wild Geese" as we call it in Ireland. If your ancestors were amongst the Jacobite forces under Sarsfield, this could well be the route they took, after all some famous French families (Château Barton and Hennessy Cognac for example) entered France this way.