Nurse Warner's day began at half-past five every morning and she remained on duty until half-past nine most nights. She and her medical colleagues moved through France and Belgium with the field hospital, or ambulance volant: a "little colony set down in the fields" complete with portable wards, operating, supply and laundry rooms and personnel quarters. She wrote often but cheerfully of the cold and discomfort that staff and patients endured, day after day:

"It has been so cold and damp to-day that I could not get warm even in bed. I like sleeping out in the little tent and as a rule sleep very well… As long as one keeps going the cold is not so apparent… It is pouring rain to-night and… I can only think of the poor men in the trenches."

They followed the French army, and one night in 1915, Agnes found herself less than 10 miles from the front:

"The first night I arrived I did not sleep, for the guns roared all night long, and we could see the flashes from the shells quite plainly; the whole sky was aglow… When the shells from the German guns landed… everything in our little shanty rattled."

Guns and bombardments signaled the imminent arrival of wounded soldiers. On February 22^nd, 1916, Agnes wrote: "I have had over one hundred wounded come in at night this last month, and as they all come directly from the trenches you can imagine what it means." Many nights an exhausted Agnes ended her hasty note with: "I am so sleepy I can hardly see, so good-night."