A couple of observations about shields:
The first figure in the top row has a Berber 'ardaga' shield only carried in N.Africa and Spain.
The standard bearer has a Western-style 'heater' shield, also used by Muslims in Spain.
The round-shield men can be used across a long stretch of the Early Medieval period-maybe 8th century on-so many Islamic forces can be fielded with these figures.
One tiny criticism-The tassels on the ardaga shield are defying gravity[:))