This song could mean a lot of different things, but in all essance of course it involves a couple, and one of em has the army in their path which sounds like this story coulda took plas in the 40's or even 30's. The couple is in love and just want the other one 2 let him know. She didn't tell him, he went to war and then he say "if you love me, why'd you let me go". And "Violet Hill is an actually place. And he askes her while there "if you love me won't you let me know.