One morning the Corps and Divisional Commanders arrived at Crown Prince House and immediately demanded a map showing the Fleury Switch. Every conceivable map was produced, but in vain; nor had anyone the faintest idea what the switch was to which they so repeatedly referred. In the end the A.D.C. to the Corps Commander sped back to the car (left round the corner out of sight), and in due course produced the precious map, and the party proceeded on their way restored to a more amiable frame of mind. On the night of March 11th "D" Company relieved "B" Company in the subsidiary line. A night or so before a German aeroplane had made a determined effort to do them serious harm by dropping a number of heavy bombs in their immediate vicinity. Oddly enough, that night, as the Adjutant and Lewis Gun Officer were undressing in their bedroom, which faced the line, they suddenly noticed that the shutters were not drawn. A rush was made for the candle, which was hastily extinguished. At that moment there was a deafening report, and we felt that here was the reward for our carelessness. However, it was soon realized that the noise was not shelling, but the above-mentioned bombing, the hum of the aeroplane being clearly audible; but after depositing its load it departed, and peace reigned once more. No casualties were caused, and quite a number of "D" Company were sleeping so soundly that they knew nothing of the matter till the following morning. It was always a remarkable thing to us who lived there that Crown Prince House was not shelled. It was a large house in full view of the enemy, standing quite isolated at the side of a long straight road. It must have been very tempting to the German gunners, who liked to see the red dust rise from a direct hit on a house. There was no sort of cellar accommodation worth mentioning. Signals had the only cellar, and that was but half underground. We used to encourage one another by saying that the Germans could not shell the house without committing _lèse majesté_ (the Crown Prince was reputed once to have made his Headquarters there), though some very recent shell-holes at the entrance seemed to prove that they were prepared occasionally to risk being guilty of that serious offence. As a matter of fact, the Headquarters of a South Lancashire Battalion were soon afterwards shelled out of the house, and a very unpleasant proceeding they found it. The only other excitement was the sudden arrival of a shell in Armentières; not by the railway-station, a place not infrequently shelled in retaliation for a 12-inch railway mounting gun which used to come up there occasionally, but right into the town, and only just over the Rue de Lille. This single shell caused quite a sensation, but as nothing more happened we concluded that the enemy had let off a gun by mistake.