Symbolism of Beyone's Run the World song?

Does anyone know the meaning and symbolism within Beyonce's (Girls) Run the World song/music video? For example, what does it mean when beyonce is holding those two hyenas on chain leashes, when all the female soldiers are dancing and the male solders are just standing there on there guard with there shields up & act as if they are afraid to approach the female solders, in the beginning when she is wearing all white but riding into a deserted battle ground on a black horse but there is a sunset in the background, and also in the end what does it mean when beyonce snatches one of the male guards badges but then her and her whole group of girls salute to them? I like the song, its got a great beat & everything, i just would like to understand the meaning/symbolism a little better haha.