1516, Thomas_More, Utopia, "Of Their Military Discipline":If they cannot disunite them by domestic broils, then they engage their neighbours against them.
1863, Charles_Reade, Hard Cash, ch. 44:Secrets disunite a family.
1843, Robert Browning, A Blot In The 'Scutcheon, Act I:You cannot bind me more to you, my lord.Farewell till we renew... I trust, renewA converse ne'er to disunite again.