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As you consider your options, your mind can only reach but a single conclusion.
Screw it.
You order a general charge - not only of your infantry and pikemen, but of your own retinue as well. You take up your lance, and, gesturing forth, lead your guards into the fray. Your livelihood may be at risk, but you know very well it shall be forfeit anyways should you lose and still escape. When your retinue closes in on the fleeing arquebusiers, already hounded by your hussars, it is like a butcher's knife cleaving through a pig. The utterly unprotected arquebusiers are skewered by your lances, some crushed underfoot by your horse's charge, and the next falling soon after by your swords. Whatever resistance they still could oppose is null, and their formation is all but broken, the raggard remainders fleing into the hills as they dropped their heavy muskets to the ground in a panic.
Not too far east, however, the situation is not so easy; with the pikemen approaching, your hussars and skirmishers retreated from their attack. The arquebusiers wasted no time in running behind the safety of their allies, their formation shaken yet unbroken, and soon enough, they were able to fire off an ragged volley into the ranks of your retreating horsemen, tearing through their ranks once more. Their numbers far too diminished, this volley is too much for the skirmishers, who begin to rout, retreating further upwards through the hill. You'll have to hope their sargeants can wrangle them before they desert the field of battle altogether and you are forced to hunt and execute them.
Your decision to retreat the skirmishers, too, has allowed the last other arquebusier company some breathing space; and seeing this stand, they begin to take off in full sprint towards the safety of the pikes, no doubt inteding to make a manner of square formation to hold off attacks from cavalry while the arquebusiers fire off at them. You'll have to deal with them quickly if you wish to win.