in which military conflict were edmund fitzalan-howard and éamon de valera commanders ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_commander dbr_Edmund_FitzAlan-Howard,_1st_Viscount_FitzAlan_of_Derwent sep_dot var_uri dbo_commander dbr_Éamon_de_Valera sep_dot var_uri a dbo_MilitaryConflict brack_close