I´ve already made a couple of medieval slingers using the fustibalus, Staff sling HERE.
They were unarmoured and due to using staff slings they carry no shields whilst using the slings.
Anyway, for a while I´ve wanted some more medieval slingers using shepards Slings and with headswops, the Norman Light slingers from Tumbling Dice fill my wish.
Swords and shields added from the bits box
Did medieval shepard slingers use shields?
A couple of pics from the twelth century Liber ad honorem Augusti sive de rebus Siculis ("Book in honour of the Emperor, or on Sicilian affairs"; also called Carmen de motibus Siculis, "Poem on the Sicilian revolt") showing slingers with shields.
HERE it´s shown that a shield and sling can be used in combination