In the light of later inscriptions it seems probable that the last four events, if not all six, were confined to Athenian competitors. In this case there must have been other events open to all comers. The introduction of local events of a military type was undoubtedly due to the development of Athenian cavalry in the latter part of the fifth century. According to Photius the war-horse was not really a horse used for war, but merely one equipped as for war in competitions. It is just possible that in the second century the race for war-horses had become a purely artificial event and the war-horse had then as little practical value as the Athenian hoplite of that time. But we can hardly suppose that this was the case in the fourth century, when Athens still possessed a real army. Every Athenian of the first two classes was bound to provide a horse for military service, and the races for war-horses must have been introduced in order to encourage cavalry training, just as the hoplite race had been intended for the benefit of the heavy-armed infantry. But the war-horse was not the same type of animal as the highly-trained and expensive race-horse, and the difference is marked in the amount of the prizes. The team of war-horses receives only 30 amphorae, the team of race-horses 140. The same difference exists in the present day between the prizes given at military or hunt steeple-chases, and those given for race-horses. Still smaller are the prizes for the processional chariots. In this event the chariots and horses may possibly have been provided by the State. We do not know how many events constituted the full programme in the fourth century; an inscription of the second century enumerates twenty-four events, and another, which is incomplete, contained at least as many.[406] It is possible that on these occasions the programme was exceptionally elaborate, owing to the presence of kings and other distinguished visitors at the festival. Certainly the inscriptions prove that at this period the programme varied considerably from time to time. On one occasion, when four sons of King Attalus were present, it appears that there were three if not four chariot-races for their benefit. Three of their names appear as victors in the chariot-race; the name of the fourth also occurs, but the inscription is here broken, and the name of the event which he won is lost. Still, making allowance for such circumstances, we can form a fairly accurate idea of the programme as it existed at this time and probably also in the fourth century.