Diary for Sunday, August 13, 1916:
Battle of the Somme: British 15th Division captures Munster Alley. Artillery duels north and south of the river on August 14.
Transylvania: Austrian First Army (Arz) formed against Rumania.
Isonzo: Catanzaro Brigade takes Hill 246 and three other positions with 900 PoWs gained at heavy cost.
North Sea: Dutch convoy escort destroyer HMS Lassoo mined and sunk.
Western Front: RFC bombs Douai airfield 3 times (86 bombs).
Mesopotamia: RFC No 30 Squadron (13 serviceable BE2cs plus 14 arriving or being overhauled) scores first victory, a Fokker over Shumran airfield (bombed at night August 14).
Britain: First 6 Tank Mk Is leave for France.