There are certainly stories reported of people encountering those things back in the day, and by people who would not be expected to be familiar with paleontology. But I'm not assuming the images are genuine.
For the sake of discussion, those are certainly bat-like wings in the first picture, but I have no experience with pteranodon wings.
As for the second picture, it does seem unusual to have that many men equipped with bayonets as well as holstered sidearms. Also, during what time frame would they all have had rectangular belt buckles? Civil War ones are generally oval, at least for enlisted personnel, right?