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Credit for summary Attack on Titan Season 4 Wikipedia.
In a flashback prior to the Declaration of War, Willy farewells his family and discusses with General Magath the high probability of a deadly attack at the ceremony, but Willy is prepared to become a martyr in support of his cause.
In the present, the Attack Titan devours Willy and continues its rampage, causing mass fatalities including the candidates Zofia and Udo. Willy's sister, Lara Tybur, transforms into the War Hammer Titan but is immediately assaulted by the Attack Titan. Lara overpowers him using her Titan hardening ability to create destructive weapons while Magath orders armor-piercing shells fired at the Attack Titan.
Meanwhile, Pieck and Porco are rescued by the Panzer Unit just as the Survey Corps commence an assault overhead. The War Hammer Titan forces Eren from the body of his Titan, but just as the War Hammer prepares to kill him, Mikasa attacks the nape of its neck with thunder spears. However, the War Hammer regenerates and Eren realizes that Lara's body is underground, connected by a long white tendril. He transforms into the Attack Titan again and severs the cord, preparing to devour her.
Suddenly, Porco's Jaw Titan leaps onto the Attack Titan's neck and attempts to eat Eren, but Levi arrives and hacks its jaw-joint, preventing it from biting. As his Titan is attacked, Porco realizes that the human Scouts are the real devils of Paradis.
NOTE: This episode is from Volume 25 of the manga.