How many advanced posts? How many men in each, by day and by night? Do they have grenades and how are they relieved?
How many men are sent out on patrol, how often, at what time, by what route coming and going? How are they dressed and armed? What are their instructions?
What does the enemy know about our own patrols?
Are snipers placed in trees during the day and at night? If so, what trees are used. What parts of our sectors can they see?
Are they planning any raids? Do they anticipate raids by us?
What work are they carrying on during the day and at night?
Have they any idea of our own activities?
What is the nature and the location of their accessory defences?
What is the location of their machine guns, trench mortars?