The Austrian and Hungarian horse artillery were in such close relation with the cavalry that their support was very good. In fact, the artillery get into position as quickly as the cavalry. The chief function which cavalry have performed successfully in this war has been that of reconnoissance. The French and German armies use aëroplanes and cavalry patrols as their principal means of reconnoissance; the latter scout in parties of from six to fifteen men commanded by an officer. The British do the same work with two motor-cycle riders. The transmission of dispatches by cavalry has become virtually nil in France because of the extensive use for this purpose of telephones, automobiles, and motor-cycles. It is very doubtful, however, if automobiles and motor-cycles could successfully be used for dispatch-bearing and reconnoissance in any country except France. On the Russian frontier the poorness and scarcity of roads make the use of automobiles difficult and the use of wheels and motor-cycles impossible. It would, therefore, seem that for reconnoissance and dispatch-bearing, cavalry will usually be the means employed. Cavalry have to a certain extent been used as reserves. They were thus first used by the British. In recent months I have often seen large French cavalry reserves. At such times they are, in effect, mounted infantry, so that reinforcements may be transferred a greater distance in a shorter time. My personal observations have led me to believe that aside from their uses in reconnoissance, the principal value of cavalry is as mounted infantry held in reserve. When fighting, cavalry must dismount. Early in the war there were occasions when cavalry fought while mounted, and whether against artillery, infantry, or other cavalry, the chief result was the killing of nearly all the horses. In the Austrian, Hungarian, and French armies many cavalry regiments have been converted into infantry. I do not think that this is chiefly due to lack of horses but to the fact that the opportunity for fighting while mounted no longer exists. ENGINEERING The only work which I observed to be done entirely and solely by engineers was the construction of bridges, of which they have had to build a great number. I was impressed by the fact that many of these bridges were quite original in conception. They are nearly always intelligent makeshifts which might truly be called inventions.