World War One Diary for Wednesday, January 17, 1917:

Western Front

Somme: British troops capture German posts on 600-yard front north of Beaucourt-sur-Ancre and repulse four counter-attacks until February 4.

Eastern Front

Austria: Emperor Charles moves Austrian GHQ from Teschen to Baden near Vienna despite Conrad’s protests.

Secret War

Britain: Royal Navy’s Room 40 partially deciphers Zimmermann Telegram two days before Bernstorff receives it in Washington.