The Battle in the Valkyrie was the final battle that Captain America participated in during World War II, where he battled and defeated Red Skull.
Captain America, the Howling Commandos, and the Strategic Scientific Reserve managed to destroy many HYDRA bases across Europe and thwarted many of their attacks.
Unable to locate Johann Schmidt and his headquarters, Captain America and the Commandos went to attack the Schnellzug EB912, a train transporting Arnim Zola.
In the attack, Gabe Jones succeeded in capturing Zola, but Bucky Barnes, Steve Rogers' best friend, fell off the train and down the mountain and was presumed dead. Zola eventually confessed to Colonel Chester Phillips that Red Skull was planning to attack almost everywhere on Earth, and gave out his location.
Rogers prepared to attack HYDRA at their headquarters with support of the Howling Commandos and the Strategic Scientific Reserve to infiltrate the base allowing being captured to masquerade a full frontal assault.
Red Skull managed to escape in the Valkyrie, and Colonel Phillips and Peggy Carter took Red Skull's car and used it to chase the plane and get Rogers onto it.