Lest the enemy should turn your flank, keep veering to the east.
Try to put this same thought into twelve words by means of a different construction.
2. When you start with one kind of construction, keep it up unless there be some good reason to change it. If you begin with the past tense and third person, have the past tense and third person continue throughout the sentence or sentences.
It is reported that extensive preparations are being made in the vicinity of CAMBRAI and the enemy has stored railroad material there.
It is reported that the enemy has made extensive preparations at CAMBRAI and has stored railroad material there.
Which sentence reads along with less break?
Again,
It is advisable to advance part of the ammunition columns and that the division should follow at 200 yards.
Better,