"We'll Meet Again" is a 1939 British song made famous by singer Dame Vera Lynn with music and lyrics composed and written by Ross Parker and Hughie Charles.
The song is one of the most famous songs of the Second World War era, and resonated with soldiers going off to fight and their families and sweethearts. The assertion that "we'll meet again" is optimistic, as many soldiers did not survive to see their loved ones again. Indeed, the meeting place at some unspecified time in the future would have been seen by many who lost loved ones to be heaven. (Wikipedia)