East Prussia

Chronological events that took place in .
 * 1914
 * 2 & 7 August – Entered by the Russians.
 * 16 August – General Russian advance.
 * 16 September – Evacuated by the Russians.
 * 2 November – Re-entered by the Russians.
 * 14 November – Advance by Russians checked.


 * 1915
 * 12 & 25 January – Russians invade.
 * 7-10, 12-14, 16, 18, 22-23 February – German offensive.
 * 19 & 21 February, 12 & 18 March – Russian counter-offensive on frontier, and hold up enemy.