Statistics for occurrence #1 of “Official Records” in chapter 6.82 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 3.:

...fective force had been reduced to less than 13,000, and that at the time of the surrender the besieging force was reduced to less than 10,000 men. But the returns of Banks's command for May 31st ( Official Records , Vol. XXVI., Pt. I., pp. 526-528) show not less than 30,000 officers and men of all arms present for duty at Port Hudson, besides the Corps d'afrique, which is not re-ported on any of the returns...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Official Records 488 122 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.