Medical attention is required all the way from the recruiting and training camps at home, and those in England and France and along the lines of communication, up to the front areas and fighting Units in the firing line, No Man’s Land and the hand-to-hand encounter in the enemy trenches. But perhaps the function of the Medical Service which calls for the greatest vigilance and most thorough care is the prevention and control of epidemic and contagious diseases. The most strenuous efforts of the Medical Services are exerted to rescue the man who is wounded in action, and to give him such prompt attention as will prevent him, as far as possible, from bleeding to death or dying from shock or exposure and to hasten him to a place where the best surgical skill can be exercised to save his life and limbs. The primary aid is under the direction of the Regimental Medical Officer who is assisted by sixteen stretcher-bearers and two orderlies whom it is his duty to keep in a constant state of efficiency by careful training, as unskilled men, during active operations, are constantly being added from the ranks to make up wastage. One Nova Scotia Regiment lost thirty-three per cent. of its stretcher-bearers in two hours in the Vimy Ridge engagement. This little coterie goes into the trenches with the Unit. The Regimental Medical Officer selects a Regimental Aid Post (R.A.P.) well to the front and as far as possible out of the direct line of enemy fire, so that the wounded may be safely cared for and promptly evacuated. The stretcher-bearers are detailed four to each Company, and these go with their Companies into action and accompany them wherever they go. They are the most exposed men in an engagement; for while the combatants may advance in rushes and seek shelter as they go, the stretcher-bearer is constantly exposed, going back and forth to the relief of the wounded. As a result of the efficiency these men attain, their dressings, applied on the battle-field during action, often can go untouched until they reach the hospital. At the Regimental Aid Post further treatment is given by the Regimental Medical Officer, food and hot tea or coffee are given and the wounded are rolled in blankets and made as comfortable as possible before being sent out. All cases are tagged, usually a white tag showing the man’s name, number, Regiment, the nature of his injury, and any special treatment or remedies that may have been given. In dangerous cases a red tag is used, which secures the right of way in rapid evacuation and immediate attention.