Some common themes include long - distance love. With soldiers being deployed far away, they have to maintain their relationship through letters or rare visits. There's also the theme of loyalty. In war, loyalty is tested not only to one's country but also to one's partner. A love story might show how a couple stays true to each other despite the temptations and difficulties that war brings. For example, a woman waiting for her husband to return from war, remaining faithful through years of uncertainty.
One common theme is separation. Lovers are often parted by the chaos of war, like in the story of a soldier sent to the frontline while his beloved stays at home. Another theme is sacrifice. A person might sacrifice their own safety or opportunities for the sake of their love during war. Also, hope is a theme. Despite the hardships, lovers hold onto the hope of reuniting and building a future together after the war.