We have a better idea than you think, its just not as developed modernly as single handled sword work, as great swords ceased being used altogether on the field some time around the mid 17thC.
Spears and pike were used well into the 19thC, though were slowly phased out. For that matter, there was still practical application, if sparse, of spears and pike in the American civil war, and were slowly phased out.
People are just not as captivated by spear combat, so the manuals of it use are largely ignored.
And then of course, the spear's cousin, the lance, was used all the way up until WWII. Fun Fact: Larry "Bozo the Clown" Harmon was one of the last units of US cavalry mounted on horseback with a lance.... Charging across trenches into machine gun fire. He lost three horses in his career.
Pic is an 18thC guide to spear combat. Specifically spear, not officer's partisan.