<a href="https://en.wikipedia.org/wiki/World_War_I" id="mwrQ" rel="mw:WikiLink" title="World War I">World War I</a>: <a href="https://en.wikipedia.org/wiki/Tanks_in_World_War_I" id="mwrg" rel="mw:WikiLink" title="Tanks in World War I">Tanks</a> are used for the first time in battle, at the <a href="https://en.wikipedia.org/wiki/Battle_of_the_Somme" id="mwrw" rel="mw:WikiLink" title="Battle of the Somme">Battle of the Somme</a>.