It's never just been soldiers who are killed in war, but over the last century increasingly more civilians are casualties. War kills and wounds far more civilians than soldiers and many of the civilian casualties are children.
According to Christian Aid's 'Count Your Blessings' Lent calendar 75% of those killed or wounded in war are civilians. By contrast in World War 1 only 5% were civilians.
Christian Aid suggests you give 10p for every country you know in conflict. I can immediately think of 10 countries, so that's £1.