Close examination of ancient historical narratives, whose authors' methods and attitudes need to be evaluated, is essential for all reconstructions of ancient warfare. This chapter discusses the problems of this material. The fullest and most regular information about ancient warfare is provided by the sequence of Greek and Latin historians whose accounts of significant public events were usually dominated by military action, but these are complex texts. The dominance of literary convention affected the earliest historians, Herodotus and Thucydides, since they were still subject to the influence of earlier traditions of narrative, especially the Homeric poems in the case of Herodotus. The basic business of gathering information created problems for constructing a clear narrative, both of the chaos of battle and the wider dimensions of warfare; in addition to the 'Whatley' problem of the partial memory of any participants, personal interests of key informants and national agendas must be considered.