Confronted by the babies that he once tried to murder, now all grown gods, Cronus has no regrets no words of remorse.
He probably knows his time has come, that the prophesy he feared his whole life is coming to pass, but he’s not going to go down without a fight.
It is Zeus, though, who actually declares war. All his life, he’s been taught that he is destined to ascend and seize the throne from his father and his time is now at hand. At this time neither god understands the horror that the war to come will truly be. How could they? There has never before been a war.