To compare loneliness to an undesirable illness or disease that is difficult to cure.
The Vietcong set up checkpoints around the nation, so that would've definitely been a literal and figurative roadblock to any refugees. Hope this helped.
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Explanation: McCrae composed "In Flanders Fields" on May 3, 1915, during the Second Battle of Ypres, Belgium. It was published in Punch magazine on December 8, 1915, and became one of the most popular and frequently quoted poems about the war. It was used for recruitment, in propaganda efforts, and to sell war bonds