Quidditch game

When James Sirius Potter accidentally smashes a time turner he sends himself, Rose, Hugo, Albus and Lily back in time to his parents 6th year at Hogwarts. The middle of a war is no place for a bunch of underage wizards. With dark forces rising and people dying everyone is desperate, and the Weasley/Potter's have the key to winning. Will the temptation be too much? Will they end up changing the future or will they keep living in the past with secrets?