What is the theme of "In Flanders Fields," a poem by John McCrae?

The theme of this poem
is that the living must continue to flight for the soldiers killed in the war. McCrae, writing
about World War I, describes the poppies that blow across the field of graves and the larks that
float above. The dead, who were alive only a short time before, are now buried in Flanders
Fields. He writes that the dead are asking the living to fight for them and to hold aloft the
torch that will continue to light their way. He says that if the living give up their fight, the
dead will not rest peacefully. This poem is about how the living must carry on the work of the
fallen soldiers to ensure that the soldiers have not died in vain. Otherwise, the soldiers'
deaths will be meaningless.