Cold and rainy weather was also distasteful to the Oriental invader: at times, when it prevailed, he did not display his ordinary firmness and daring, and could be attacked at great advantage. Much could also be done by delivering a vigorous raid into his country, and wasting Cilicia and Northern Syria, the moment his armies were reported to have passed north into Cappadocia. This destructive practice was very frequently adopted, and the sight of two enemies each ravaging the other’s territory without attempting to defend his own, was only too familiar to the inhabitants of the borderlands of Christendom and Islam. Incursions by sea supplemented the forays by land. ‘When the Saracens of Cilicia have gone off by the passes, to harry the country north of Taurus,’ says Leo, ‘the commander of the Cibyrrhœot Theme should immediately go on shipboard with all available forces, and ravage their coast. If, on the other hand, they have sailed off to attempt the shore districts of Pisidia, the Klissurarchs of Taurus can lay waste the territories of Tarsus and Adana without danger.’ Nothing can show more clearly than these directions the high average skill of the Byzantine officer. Leo himself was not a man of any great ability, and his ‘Tactica’ are intended to codify an existing military art, rather than to construct a new one. Yet still the book is one whose equal could not have been written in Western Europe before the sixteenth century. One of its most striking points is the utter difference of its tone from that of contemporary feeling in the rest of Christendom. Of chivalry there is not a spark in the Byzantine, though professional pride is abundantly shown. Courage is regarded as one of the requisites necessary for obtaining success, not as the sole and paramount virtue of the warrior. Leo considers a campaign successfully concluded without a great battle as the cheapest and most satisfactory consummation in war. He has no respect for the warlike ardour which makes men eager to plunge into the fray: it is to him rather a characteristic of the brainless barbarian, and an attribute fatal to any one who makes any pretension to generalship. He shows a strong predilection for stratagems, ambushes, and simulated retreats. For an officer who fights without having first secured all the advantages to his own side, he has the greatest contempt. It is with a kind of intellectual pride that he gives instructions how _parlementaires_ are to be sent to the enemy without any real object except that of spying out the number and efficiency of his forces. He gives, as a piece of most ordinary and moral advice, the hint that a defeated general may often find time to execute a retreat by sending an emissary to propose a surrender (which he has no intention of carrying out) to the hostile commander[46]. He is not above employing the old-world trick of addressing treasonable letters to the subordinate officers of the