Misc: Which acid is found in nettle stings?

Questions

In 1914 Cardinal Giacome della ---------- becomes Pope Benedict XV?

In 1914 Cardinal Giacome della Chiesa becomes Pope----------?

In 1916 Allies turned back Germans in WW I's Battle of----------?

In 1939 Britain declares war on Germany France follows 6 hours later quickly joined by Australia, New Zealand, South Africa and----------?

In 1940 ---------- Collins, London England, actress (Shirley Valentine), born?