The three heroic Americans who overpowered a gunman on a high-speed train in France spoke out about the harrowing incident at a news conference in Paris today.

Air Force serviceman Spencer Stone, Sacramento State University senior Anthony Sadler and National Guardsman Alek Skarlatos were on a train that was traveling between Amsterdam and Paris.

Stone explained that he heard a gunshot and breaking glass. He saw a shirtless man carrying what appeared to be an AK-47, which jammed on the gunman.

Stone said that Skarlatos tapped him on the shoulder and they jumped into action, tackling the suspect to the ground.

"Alex came up and grabbed the gun out of his hand while I put him in a chokehold," Stone explained. "It seemed like he just kept pulling more weapons left and right. [He] pulled out a handgun. Alek took that. [He] took out a box cutter and started jabbing at me with that."

Stone, who suffered several wounds in the struggle, said that all three Americans began punching the suspect, and he eventually was able to choke him unconscious.

"He seemed like he was ready to fight to the end. So were we," Stone said.

"It wasn't really a conscious decision," Skarlatos explained. "We just kind of acted. There wasn't much thinking going on."

Sadler said the lesson he would want others to take from the incident is to take action in times of crisis.

"Do something. Hiding or sitting back is not going to accomplish anything," Sadler said. "The gunman would have been successful if my friend Spencer had not gotten up."

Watch more above.

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