Text: In the following year, however, civil war broke out between the supporters of Michael Collins and Arthur Griffith, who had signed the treaty, and Eamon De Valera's followers.
Entailment: Followers of Michael Collins and Arthur Griffith clashed with followers of Eamon De Valera.
Contradiction: After signing the treaty, Michael Collins and Arthur Griffith's followers formed an alliance with those of Eamon De Valera.