Stories of kids in wartime

Theresa Breslin Remembrance: The destinies of two Scottish families, one of shopkeepers and one of wealth and power, become entwined through their involvement in World War I, social causes, and love.
Ken Catran Letters from the coffin-trenches
Berlie Doherty The sailing ship tree: At the outbreak of World War 1, twins Dorothy and Walter strike up a secret friendship with George, the son of the Big House where their father is a butler. When George's father disappears, the twins are desparate to help their friend George and from the branches of a large tree the begin to hatch a plot.
Anthony Hill Soldier boy: the true story of Jim Martin, the youngest ANZAC (J 920 MAR)
Iain Lawrence Lord of the nutcracker men: An English boy during World War I comes to believe that the battles he enacts with his toy soldiers control the war his father is fighting on the front.
Harry Mazer A boy at war: a novel of Pearl Harbor: While fishing with his friends off Honolulu on December 7, 1941, teenaged Adam is caught in the midst of the Japanese attack and through the chaos of the subsequent days tries to find his father, a naval officer who was serving on the U.S.S. Arizona when the bombs fell.
James Riordan When the guns fall silent: Two friends, Jack and Harry, both keen footballers, are recruited for the army and sent to fight in the trenches in World War I. The author brings to life the horror and fears of both sides as they fought and ends with an account of the football match played in the Christmas truce of 1914.
Don L. Wulffson Soldier X: In 1943 sixteen-year-old Erik experiences the horrors of war when he is drafted into the German army and sent to fight on the Russian front.