According to these reports roughly 1,360 of the 3,912 men of Garlands and Deshler Brigades excaped capture. That is roughly 1/3 of those commands. It is interesting that Dunnington's Brigade (19th, 24th Arkansas, and Crawfords Battalion) are not enumerated. Nor Dunningtons naval detachment which were surrender and paroled by the Union navy and released.
Many of the 24th Arkansas were at St. Charles and a lot of the 19th Arkansas were sick in Hospitals at Pine Bluff/Camp White Sulphur Springs. These men were formed into what was to become Hardy's Regiment.
If you say that the 1,360 excaped before they were enumerated as Prisoner along with the three Cavalry commands who also excaped (Denson, Richardson, and Nutts) there would seem to have been a much larger Confederate force at Arkansas Post than was previously assumed.