Trevor was taken to be interrogated using the Lasso of Hestia. Though he tried to resist the lasso's power at first, unwilling to reveal military secrets, he nonetheless was powerless to withstand it and admitted that he was a spy. He told them that he'd been on a mission to observe General Ludendorff and Doctor Poison, that he'd stolen the latter's research notebook, and that his escape had brought himself and the Germans to Themyscira. He described the Great War, informing them that millions of people had died. Hearing this, Diana deduced that only Ares could be behind a war of that magnitude. She tried to persuade Hippolyta to send the Amazons back with him to face the god, but her mother refused, much to Diana's confusion.
Flash and Cyborg save all the hostage, which Silas Stone tells Victor that Steppenwolf can not get the final Mother Box. Batman then jumps down into the Knightcrawler and saves Wonder Woman after a Parademon manages to briefly knock her out. The Knightcrawler gets attacked by Steppenwolf, and Barry helps Wonder Woman get her sword so she can help Batman.
The New 52 universe does not have a "Diana Prince" identity as stated in an interview by series writer Brian Azzarello. However, when she and Superman began dating, for her civilian identity she used the Diana Prince alias whenever she was around Clark Kent; such as when she introduced herself to Lois Lane at Lois's housewarming party under that name.