A Machine Gun Company was attached to each Infantry Brigade and their subsequent Division, an additional Company was attached as a divisional reserve.
| Brigade attached to: | Divisional Reserve |
| Division attached to: | 3rd Division |
The 233rd M.G. Coy. joined the 3rd Division on the 18 July 1917.
On 06 March 1918, it was amalgamated with the 8th, 9th and 76th Machine Gun Companies to form No. 3 Battalion, Machine Gun Corps.
As a unit of the 3rd Infantry Division, it will have taken part in the following battles and engagements.
| 1917 | |
| BATTLES OF YPRES | |
| 22 to 25 September | Battle of the Menin Road Ridge [V. Corps, Fifth Army] |
| 25 to 30 September | Battle of Polygon Wood [V. Corps, Fifth Army, until 10 a.m., 28 September, then under II. ANZAZ Corps, Second Army]. |