Capture of Arnim Zola

"We were right. Dr. Zola's on the train. HYDRA dispatcher gave him permission to open up the throttle. Wherever he's going, they must need him bad."

- Gabe Jones to Captain America and the other Howling Commandos

The Kidnapping of Arnim Zola was an operation during World War II to capture the lead HYDRA scientist, and deliver him to SSR custody. Captain America led the Howling Commandos in a daring raid of the high-tech Schnellzug EB912 to capture him in 1944, depriving the Nazi deep science division of their greatest engineer.

Background
In late 1944, the Strategic Scientific Reserve had managed to crack HYDRA's encryption codes, and were able to listen in on their radio communications. This ability, coupled with other intelligence, allowed the SSR to confirm Dr. Arnim Zola's presence on board a Schnellzug EB912 travelling through the snowy Austrian. The Howling Commandos, led by Captain America, were assembled and tasked with the recovery of Dr. Zola.

Hijacking the Train
Having tracked where the armored train would be, the Howling Commandos posted up on a nearby cliff overlooking the train tracks as Gabe Jones confirmed that Dr. Zola was a passenger. The Commandos set up a zip-line from the cliff to the mountainside on which the tracks ran, allowing them to travel safely over a deep valley. One by one, Captain America, Bucky Barnes, and Gabe Jones slid over the valley and landed on top of the train as it passed by, with Jacques Dernier calling out when each member of the assault team should begin their jump. The other Howling Commandos stayed behind, acting as overwatch for the now in-progress mission.

When the three assaulter landed on the top of the train, they began to carefully walk to where they were supposed to go: Rogers and Barnes worked together as a distraction/infiltration team, inserting near the middle of the train, to draw Zola's guards away from him; while Gabe Jones continued walking along the top to reach the now-unprotected doctor in the pilot.

The plan began as it should have, as swarms of HYDRA guards began pouring out of the pilot and into the middle cars of the train. Barnes and Rogers engaged them in a tense firefight, trading shots from behind cover. Unfortunately, the duo were separated by mechanical doors as their enemies emerged. Rogers managed to kill his one assailant; a soldier dual-wielding two HYDRA Cannons, and used the directed-energy weapons to blast open the first of the doors, allowing him to manually open the second. Rogers tossed an M1911 pistol to Barnes, who had run dry of ammunition, and the two worked in tandem to kill the remaining HYDRA guard in the room.

Barnes' Fall
Before the pair could celebrate, another HYDRA soldier attacked Rogers and Barnes, again wielding the dual HYDRA Cannons. Rogers pushed Barnes out of the way, and deflected an energy pulse. The blast ripped the side of the train open, exposing the interior to the cold winter air outside as Rogers was knocked on his back from the force. Seeing that the HYDRA soldier was charging up another shot, Barnes leaped to his feet and scooped up Captain America's shield, and shot at the guard. Unfortunately, Barnes was unable to kill his enemy, who fired another pulse of energy. This blast sent Barnes flying out of the train, though he was able to grab part of the destroyed hull and hang on. Captain America recovered from his own stumble, and quickly killed the HYDRA guard before rushing out to try to save his friend. As Rogers urged Barnes to take his hand, the railing Barnes was clinging to snapped, sending him plummeting into the icy river in the valley below. Captain America could only look on in horror, shock, guilt, and regret as his friend fell.

Zola's Capture
As Zola had been radioing his troops directly, urging them to kill Rogers and Barnes, he was not focused on keeping himself safe. As such, he did not hear Gabe Jones' footsteps on the roof, and was taken by surprise when the Howling Commando burst through the ceiling window, holding him and another HYDRA officer at gunpoint with a Thompson submachine gun. Jones arrested the pair, and the Howling Commandos, with the exception of Barnes, were eventually extracted.