APC Image: AK 1075: Spear-point and arrow heads of iron and obsidian. The iron arrow-heads are flat, with midrib and two flanges. Most of them are provided with a tang which was attached to the shaft, but a few have sockets. They are, as a rule, so corroded that the exact shape cannot easily be determined. One small specimen, the middle one in the lower row, is triangular in section. The iron arrow-heads are considerably larger than those of bronze. The small point in the lower right corner, which is made of obsidian, was not found with the others. It came out of a prehistoric fill. The best preserved of the iron spear points discovered together with the arrow-heads is shown in this picture. It consists of a flat blade with midrib and a socket for the shaft. There can be little doubt that the spear points and arrow-heads (except the small one of obsidian) date from the time of the Persian attack on the Acropolis. The latest of the sherds from the fill in which the weapons were discovered belong to the early years of the fifth century. Since so large a percentage of the arrow-heads are bent or blunted at the point, it is obvious that they were used in action on the spot. They all belong to types common in Greece in the classical period. The place where the weapons were discovered, near the Mycenaean postern gate, has always been the most assailable point of the wall, apart from the main approach on the west side, and the beginning army of the Persians would obviously launch their attacks here. The arrows shot against the defenders and repelled by their shields and by the wall, would tend to accumulate at the foot of the rock, where they were buried in the debris.