>>18077941
There aren't many sources about tactics and armaments from those time periods - simply because the "scientification" wasn't really applied to the military. That began to change at the end of the 16th century and only really by the 18th century were there plentiful manuals. But one can sift through the accounts of battles and inventory lists to piece together 15th & 16th century warfare to understand it. And luckily some autists have already done so.
The Osprey series gives brief overwies into those topics and most importantly, they list their primary and secondary sources so one can do further reading.
I would suggest that you start with pic rel, as this gives a broad overwiev of the evolution of pike and shot tactics employed by various european states. Then you can look further into specific states like Spain, the Dutch and the HRE, etc.
If you want to directly go to a primary source then I too have a few examples for you:
1) Wapenhandelinghe van Roers Musquetten ende Spiessen (Handling of the Calivers, Muskets and Pikes) is a 1607 drill manuel illustrated by Jacob de Gehyn II. Those are *the* illustrations when one talks about pike and shot and you should find full texts rather easily. Mind you that this piece isn't as exhaustive as later drill manuels and it primarily shows how to handle the weapons and the associated stances.
Here is one example of a full text:
https://wiktenauer.com/wiki/Wapenhandelinghe_van_Roers_Musquetten_ende_Spiessen_(Jacob_de_Gheyn_II)
2) Kriegskunst zu Pferdt (Art of War on Horse), Kriegskunt zu Fuß (Art of War on Foot), Archiley-Kriegskunst (Artillery Art of War) by Johann Jacobi von Wallhausen. All three from 1615/16/17. Finding full texts is a bit more challanging - I found scans of the german original but am not sure if english translations are available.
