How should historians judge claims in national archives?

How often is information in national archives wrong?

Archival reports are rarely simply wrong, but their date, purpose, evidence, and contemporary strategic context must be separated from what later hindsight reveals.

A report written immediately after a battle reflects what commanders knew and what the operation enabled at that moment. Taranto or Cape Matapan could be critically important because each created a temporary window of security for follow-on operations, even if its apparent importance diminished later. A later historian has the rest of the war available and can therefore mistake hindsight for evidence that the contemporary assessment was false. The methodological lesson is to reconstruct the report's timeframe and purpose before declaring it mistaken from the perspective of the war's final outcome.