PBS America (Freeview) Today

How fortresses redefined the art of warfare, starting with the daunting fortress of Richard the Lionheart - an amazing feat of medieval military construction

Catholic king Louis XII's troubled bid to overcome La Rochelle - the largest Protestant base in France

Ten years in the making, this series tells the epic story of the Vietnam War, bringing the war and the chaotic epoch it encompassed viscerally to life

President Kennedy and his advisers wrestle with how deeply to get involved in South Vietnam, as the increasingly autocratic Diem regime faces a growing communist insurgency

Hardliners in Hanoi seize the initiative and send combat troops to the south, accelerating the insurgency, while US president Lyndon Johnson escalates America's military commitment

North Vietnamese troops stream down the Ho Chi Minh Trail into the south, while Saigon struggles to pacify the countryside and the anti-war movement builds back in the US