- Somme, Somme River, Battle of the Somme - battle of World War II (1944)
--1 is a kind of pitched battle
--1 is a part of World War II, World War 2, Second World War - Somme, Somme River, Battle of the Somme - battle in World War I (1916)
--2 is a kind of pitched battle
--2 is a part ofWorld War I, World War 1, Great War, First World War, War to End War