As soon as the weather was favourable the two airships sailed from Farnborough; the _Gamma_ for Kneesworth camp, on the defending side, the _Delta_ for Thetford, on the attacking side. The _Delta_ broke down over North London, but so successful was the wireless installation that her messages reporting the break-down were received near Thetford and at Portsmouth by H.M.S. _Vernon_; the _Beta_ took her place, but was too small to carry the wireless installation. The _Gamma_ was thus the only craft fitted with wireless, and the efforts of the attacking side were devoted to intercepting her messages at a ground station. The _Gamma_ was an unqualified success. Her signals came in strong and loud from a distance of thirty-five miles to a station at Whittlesford fitted with naval service receiving apparatus. Speaking of the work of aircraft, General Grierson, who commanded the defending force, says: 'The impression left on my mind is that their use has revolutionized the art of war. So long as hostile aircraft are hovering over one's troops all movements are liable to be seen and reported, and therefore the first step in war will be to get rid of the hostile aircraft. He who does this first or who keeps the last aeroplane afloat will win, other things being approximately equal.... The airship, as long as she remained afloat, was of more use to me for strategical reconnaissance than the aeroplanes, as, being fitted with wireless telegraphy, I received her messages in a continuous stream and immediately after the observations had been made.... It is a pity that the airship cannot _receive_ messages by wireless, but doubtless modern science will soon remedy this defect.'