In pictures: Faces of Battle

When he returned to Britain in 1916, Gillies set up a facial ward at The Cambridge Military Hospital in Aldershot. After the Battle of the Somme, the team there expected 200 casualties – but they got 2,000.

It was clear a dedicated hospital was needed – the world's first.

A year later, thanks to Gillies, the Queen Mary in Sidcup was opened.

In all, 5,000 soldiers were treated there by a team of surgeons and other specialists drawn from all over the Commonwealth.