Fr Doyle wrote the following in his diary on October 25 1916. It refers to the previous night, in other words, this evening and night 99 years ago. It is worth remembering that at this time Fr Doyle was at the Front. His prayer was conducted in a dug out, not in the relative comfort of a Jesuit house far from violence and death. He obviously found it hard, hence his use of the old strategy of making a vow not to give in to tiredness.  

Jesus has long urged me to give Him a whole night of prayer and reparation. Last night I prayed in my dug-out at Kemmel from 9 till 5 (eight hours), most of the time on my knees. I bound myself beforehand to do so by vow in order not to let myself off. Though I had only two hours’ sleep, I am not very tired or weary today. Jesus wants more of these nights of prayer, adoration and atonement.