100 Years Ago Today on 15 May 1917

​One hundred years ago on 15 May 1917
31st Battery, Canadian Field Artillery, Canadian Expeditionary Force had recently become a sub-unit of the 9th Canadian Field Artillery Brigade in the 3rd Canadian Division. The 9th Brigade war diary records:
Visibility fair. Enemy actively engaged in shell- VIMY throughout the afternoon. Two of our new Triplanes prevented four of the enemy planes from crossing our lines.
Warning Order No. 1 issued today, gives the following new Zone Boundaries for this Group: Northern Boundary S.18.b.2.0 to S.12.d.6.4.-T.7.b.2.8. – N.32.c.8.8., Southern Boundary T.4.b.5.4. to T.9.c.5.0.
The above changes in Boundaries is not to take place till a later date.
 
58th Battery, Canadian Field Artillery, Canadian Expeditionary Force was a sub-unit of the 14th Canadian Field Artillery Brigade in the 5th Canadian Division. The Division was training in England and the Brigade war diary records:
WITLEY – he BDE spent day on HANKLEY COMMON, practising march past and running off elimination sports for VICTORIA DAY. A bCM? Held DR. J.H. Fisher not guilty of the charge of sleeping on his post. Swill contracts change hands. Leave is to be granted over 24th of May.
 
5th Canadian Siege Battery, Canadian Artillery, Canadian Expeditionary Force war diary records:
DIVION – Battery on rest in Billets at DIVION.
 
The 15th Field Artillery Regiment RCA perpetuates the following sub units:
31st Battery, Canadian Field Artillery, Canadian Expeditionary Force,
58th Battery, Canadian Field Artillery, Canadian Expeditionary Force,
5th Canadian Siege Battery, Canadian Artillery, Canadian Expeditionary Force,
68th Battery, Canadian Field Artillery, North Russia Expeditionary Force, was not authorized to be formed until 3 August 1918, and
85th Battery, Canadian Siberian Expeditionary Force was not authorized to be formed until 12 July 1918.