The Ben. note quotes Balsamon, Zonaras, and Alexius Aristenus as remarking on this that Basil gives advice, not direction, and regards the hands, not the hearts, of soldiers as defiled; and as recalling that this canon was quoted in opposition to the Emperor Phocas when he wished to reckon soldiers as martyrs.  The canon was little regarded, as being contrary to general Christian sentiment. cf. Athan. Ep. xlviii. p. 557 of this edition:  “In war it is lawful and praiseworthy to destroy the enemy; accordingly not only are they who have distinguished themselves in the field held worthy of great honours, but monuments are put up proclaiming their achievements.”