St Omer. Change tents in morning. Dig a trench round it in afternoon for something to do. Have a hot bath in the town in the evening and finish up with Colgate at a little restaurant in the Rue-de-Calais, where one of the daughters of the house, whose husband is in Paris, obliges by singing to us. She has travelled all over the world practically, and is resuming her journeys after the war. Raining hard. Forgot to mention yesterday, had to attend before Capt. Otter to give evidence against sentry arrested yesterday.