<Tr> <Th> Design </Th> <Td> Coat of Arms of Pennsylvania on a white field, with two banners above and below </Td> </Tr> <Table> <Tr> <Th_colspan="2"> Flag and coat of arms of Pennsylvania </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th_colspan="2"> Versions </Th> </Tr> <Tr> <Td_colspan="2"> Historical coat of arms (illustrated, 1876) </Td> </Tr> <Tr> <Td_colspan="2"> The coat of arms is often used in the form of a "seal" </Td> </Tr> <Tr> <Td_colspan="2"> The coat of arms as it appears on the obverse of the Great Seal . </Td> </Tr> <Tr> <Th_colspan="2"> </Th> </Tr> <Tr> <Th_colspan="2"> Details </Th> </Tr> <Tr> <Th> Armiger </Th> <Td> Commonwealth of Pennsylvania </Td> </Tr> <Tr> <Th> Adopted </Th> <Td> 1778 </Td> </Tr> <Tr> <Th> Crest </Th> <Td> Bald eagle </Td> </Tr> <Tr> <Th> Torse </Th> <Td> Gold and White </Td> </Tr> <Tr> <Th> Supporters </Th> <Td> Horses </Td> </Tr> <Tr> <Th> Motto </Th> <Td> Virtue, Liberty, and Independence </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Flag and coat of arms of Pennsylvania </Th> </Tr> <Tr> <Th_colspan="2"> Versions </Th> </Tr>

What do the horses mean on the pennsylvania flag