redirect multiple url's

In our sites former incarnation we had a number of different slide-shows which were built so that each image had it’s own page/url.

We moved the site to wordpress and are using wordpress galleries for our slideshows – I want to redirect all the old images to the appropriate gallery page – and after a lot of googling, can’t suss out a way to use one redirect to cover multiple URL’s – for instance I want to redirect both

http://achls.org/content/ACHLS-Media/Antietam-Slideshow/thumbnails/14-Antietam__cannon.jpg

and

http://achls.org/content/ACHLS-Media/Antietam-Slideshow/thumbnails/33-AntietamAftermath1862.jpg

(and many more)

to

http://achls.org/battle-antietam-photographic-tour

any ideas how to do this with one redirection, rather than creating hundreds?

thanks!

https://wordpress.org/plugins/redirection/