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.