They broke down walls, plowed through barricades and manned the fences to prevent an unsuspecting backdoor attack. Equipped with new tactical training and recently acquired Canadian-made armored vehicles, specialized units of Haiti’s national police force have started to take back control of the country’s main oil terminal and seaports from powerful gangs after two months. The police operation in Port-au-Prince to restore fuel distribution and access to the ports, where hundreds of containers have been stuck, got underway in earnest Thursday morning, and is expected to continue over the next f…