Another fundamental error in many of the indignant letters about the alleged defects of our artillery arises from a misunderstanding of the real value of guns in attacking a fortified position. The most sanguine officer never expects his shells actually to kill or disable any very large number of the enemy if they are protected by deep and well-constructed earthworks. Of course, if a shell falls plump into a trench it is pretty certain to play havoc with the defenders, but, when one considers that the mouth of a trench is some five or six feet wide, it is easy to realise the difficulty of dropping a shell into the narrow opening at a range, say, of 4,000 yards. Moreover, some of the more elaborate Boer trenches are so cleverly constructed in a waving line like a succession of S's, that even if a shell does succeed in pitching into one bit of the curve it makes things uncomfortable only for the two or three men who occupy that portion of the earthwork. No, the real value of artillery in attack is to shake the enemy and keep down his rifle fire. If shells are accurately fired the tops of trenches may be swept by a constant rain of shrapnel bullets, under which the enemy's riflemen will of necessity suffer when they expose their heads and shoulders to take aim over the parapet. But even in this case the shell fire must be extremely accurate if it is to be of any great use. If shrapnel shells burst well, some thirty yards in front of the enemy, the force of the bullets released by the explosion is terrific; if, on the other hand, the shells burst high up in the air, 150 yards in front, you might almost keep off the bullets with an umbrella; and one sometimes hears of these missiles being actually found in the pockets of combatants. At Omdurman our shells played tremendous havoc with the dense masses of the enemy; but here the Dervishes advanced to the attack in broad daylight and over a flat plain absolutely devoid of cover, and with its "ranges" well known and marked out beforehand. In one of our southward journeys with a load of wounded men we passed, a little below Graspan, through the midst of a swarm of locusts. We pulled up the windows and so kept the wards free from these clumsy insects. At one period they seemed to almost shut out the daylight, and it was easy to realise how unpleasant it would be to meet a flight of locusts when walking or even riding on horseback. Some odd stories are told about these creatures. I have heard it gravely stated that occasionally a train is stopped by the accumulated masses which fall on the metals. My informant evidently believed that the engine in these cases was absolutely unable to force its way through the piled up insects, in the same way as trains are sometimes blocked by gigantic snowdrifts! This, of course, is ridiculous; what really happens is that the rails become so greasy from the crushed bodies of the locusts that the wheels can secure no grip on the metals and spin round to no purpose.