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Phil is present when Bertolt Hoover and Reiner Braun reveal themselves to be the Colossus and Armored Titans, and witnesses their fight with the Survey Corps, and Eren Yeager's kidnapping. In the aftermath, he is sent to report to Commander Pixis that there is no breach in Wall Rose, and that three Titans were found hiding in the 104th Training Corps.
Phil is one of the many soldiers dispatched beyond the Walls to rescue the kidnapped Eren Yeager and Ymir from the traitors Reiner Braun and Bertolt Hoover. When the soldiers were attacked by Titans, Hannes ordered Phil to lead their horses away from the Titans.