They are the same shape as a turkey egg and a little larger. Upon with drawing the firing pin a lever sets a four-second fuse going. One of these grenades will clean out anything living in a ten-foot trench section. It will also kill the man who is throwing it if he holds it more than four seconds after he has pulled the pin. The bird man of each ten was an expert bomb thrower, equipped as lightly as possible to give him freedom of action. He carried a few bombs himself, but the main supply was carried by the fourth man, who was not to throw any unless the third man became a casualty, in which case No. 4 was to take his place. The third man also carried a knob kerrle, a heavy bludgeon to be used in whacking an enemy over the head. Ours were made by fastening heavy steel nuts on a stout stick of wood, a very businesslike contrivance. The fourth man, or bomb carrier, besides having a large supply of Mills grenades, had smoke bombs, to be used in smoking the Germans out of dugouts and later, if necessary, in covering our retreat, and also fumigate comb. The latter are very dangerous to handle. They contain a mixture of petrol and phosphorus and weigh three pounds each. On exploding they release a liquid fire which will burn through steel. 