Procopius affirms (l. iv. c. 6) that the Danube was stopped by the ruins of the bridge. Had Apollodorus, the architect, left a description of his own work, the fabulous wonders of Dion Cassius (l lxviii. p. 1129) would have been corrected by the genuine picture Trajan's bridge consisted of twenty or twenty-two stone piles with wooden arches; the river is shallow, the current gentle, and the whole interval no more than 443 (Reimer ad Dion. from Marsigli) or 5l7 toises, (D'Anville, Geographie Ancienne, tom. i. p. 305.)