Another source.
https://books.google.hn/books?id=Py9Y_HejORQC&pg=PR591&lpg=PR591&dq=maccabean+army+greek+slingers&source=bl&ots=--cLi0gFq_&sig=ACfU3U1GFQCdPTGPHTRiLt7_iJ0pjDnFYw&hl=es&sa=X&ved=2ahUKEwim6cWO4OnjAhUFwVkKHZubAp4Q6AEwGHoECAgQAQ#v=onepage&q=maccabean army greek slingers&f=false