The basic plan (Mats)

With a bit of luck I might squeeze four instead of three infantry regiments out of my pile of miniatures. I will then be able to field a brigade according to the 'Dutch system' as seen in the diagram. 

'A Brigade or Tertia, the Third Part of an Army, according to the Prince of Orange'. After Richard Elion's The Compleat Body of the Art Military, 1650. This shows a later development of Dutch practice: 'battalions' are only six deep, and are supported by light guns, both features indicating Swedish influence (M = musketeers, P = pikemen).