Continuing the fight
While Captain Avenger: The First Avenger was a pretty good movie, the real purpose was to create future MCU movie plots. One of the most obvious of which was during the epic train combat scene. While temporarily disarmed, Bucky picks up the shield and continues the battle.
This scene doesn’t just predict the transition into Captain America: The Winter Soldier, but it was also super-awesome to see the iconic shield-catching transition into the sequel. We weren’t particularly happy with how The Winter Soldier turned out, but that’s just us. The film was undoubtedly entertaining, nonetheless.