World War 1

General

6/28/1914
7/5/1914
7/29/1914
7/31/1914

War declarations, etc.

7/28/1914
7/30/1914
8/1/1914
8/3/1914
8/4/1914
8/6/1914
8/13/1914
10/29/1914
5/23/1915
4/6/1917
3/3/1918

Agreements, treaties, etc.

11/11/1918
6/28/1919
9/10/1919
11/27/1919
6/4/1920
8/10/1920

Significant battles

8/4/1914
8/23/1914 - 8/30/1914
9/5/1914 - 9/12/1914
10/19/1914 - 11/22/1914
4/22/1915 - 5/25/1915
2/21/1916 - 12/18/1916
5/31/1916
7/1/1916 - 11/18/1916
1/1917 - 11/11/1918
4/16/1917 - 5/9/1917
7/31/1917 - 11/6/1917
9/18/1917