The tanks drove along either side of the Flers trenches from right to left , firing at the German infantry .
The tanks silenced machine - guns firing from the west side of the Abbey enclosure , enabling the infantry to resume their advance .
The tanks drove along either side of the Flers trenches from right to left , firing at the German infantry and silenced machine - guns firing from the west side of the Abbey enclosure , enabling the infantry to resume their advance .