For the autumn army manœuvres of 1910, which were due to take place in Picardy, it was decided to make as complete a test as possible of the value of the aeroplane as a scout in time of war. Ten or fifteen machines were requisitioned for the experiments, some being stationed with each of the manoeuvring forces. To augment the military pilots, several civilian airmen readily gave their services, notably Mr Hubert Latham with his Antoinette, and M. Louis Paulhan, flying a Farman. Although this was the first time aeroplanes had been used in mimic warfare, and although the airmen themselves, and the military authorities, were naturally unacquainted with the best methods of utilising the new "arm," astonishing results were nevertheless obtained. Two French officers. Lieutenant Sido and Adjutant Menard, were highly successful in their work. This was due to the fact they had gone through a careful course of training and were, in consequence, familiar with the task of compiling precise and informing reports of all that they saw when upon a reconnoitring flight. Lieutenant Sido acted as observer upon the Farman biplane which they were using, and Adjutant Menard undertook the work of pilot. The former carried maps with him, and made frequent notes as the machine flew from point to point. The value of the work these two officers were able to perform, is best indicated by setting forth the actual result of two of their reconnoitring flights. On the first occasion, acting under definite instructions, they left a place named Poix at 6 a.m., and flew over a sixty-kilometre course, being an hour and five minutes in the air, before returning to their starting-point. This is the form in which they presented their report to Headquarters:— 6.5 A.M.— At Thieuloy, three squadrons of _chasseurs-a-cheval_, hidden behind the southern edge of the village on the road from Thieuloy to St Maur. 6.30 A.M.— At Feuquieres, a brigade of infantry on the march eastward on the road from Feuquieres to Brombos. Head of main body just leaving Feuquieres. Six batteries of artillery parked south of Feuquieres. 6.32 A.M.— At point 1800 metres north of Feuquieres, two companies on outpost, one facing north and the other northeast, astride the Feuquieres-Sarcus road. One company has dug rifle-pits to the west, and the other company section trenches to the east of the road. A Blériot monoplane has just landed behind the company west of the road. We followed its flight for three minutes. 6.40 A.M.— Agneres—A company in column of route marching from Agneres towards Mereaucourt along the Saint Martin-de-Ponsis ravine.