Such is the story of how H.M.S. Birmingham sank the German submarine U 9. Some accounts tell us that the periscope was not shot away, but that when the torpedo from the submarine missed its mark, the cruiser made a rapid turn and drove straight at her, crumpling her to pieces by the terrible force of its weight and speed. This is the method which our cruisers usually adopt when attacked by submarines. They steam rapidly in a zigzag course, so as to disconcert those who are aiming the torpedo, and, at the first sign of the submarine's presence, charge down upon her and sink her.

A cruiser ramming a submarine.

CHAPTER XVIII.

INFANTRY AND ITS WORK.

Before I describe the German invasion of Belgium, I must explain certain military terms which will crop up again and again in the following pages. Unless you understand these terms, you cannot read war news intelligently.

An army, you know, is a body of armed men, trained and organized and disciplined for the work of war. Most of the fighting men in an army are either infantry, cavalry, or artillery. Let me tell you something about each of these "arms."

Infantry are foot-soldiers armed with rifles and bayonets. In time of peace you have seen them marching by in their scarlet and blue uniforms and smart spiked helmets. You have also seen the Highlanders, with their waving feather bonnets, short scarlet coats with yellow facings, white belts and gaiters, plaid stockings, and bare knees. In time of war all these fine uniforms are discarded, and the men are dressed in khaki.