Communist fighters launched major attacks from a claustrophobic network of tunnels, and US marines had to flush them out. The Snows explore the Tet Offensive of 1968, the turning point of the Vietnam War.

Night-fighting and air support proved crucial when Argentina invaded the Falkland Islands in 1982 - the last battle on British territory. The Snows fly 8,000 miles to the South Atlantic to tell the story of how the British Task Force fought back to regain control.