In a 2023 Trial where the #Jury found Donald Trump Liable for sexual abuse of E. Jean Carroll and for #Defamation, he didn't Testify (though he testified in a short follow up trial later) so why was Donald Trump (if innocent) testifying under #Oath?

In a 2023 Trial where the #Jury found Donald Trump Liable for sexual abuse of E. Jean Carroll and for #Defamation, he didn't Testify (though he testified in a short follow up trial later) so why was Donald Trump (if innocent) testifying under #Oath?
In a 2023 Trial where the jury found Donald Trump Liable for sexual abuse of E. Jean Carroll and for #Defamation, he didn't Testify (though he testified in a short follow up #Trial later) so why was Donald Trump (if innocent) testifying #UnderOath?